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drilling of boreholes
 
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أعمال الحفر لمعالجة ظهور التكهفات بتربة التاسيس
Views: 129 Reda Hassan
Grouting a Borehole-CoalGeology.Com
 
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http://coalgeology.com Simple Video showing cement grouting of borehole.
Views: 937 Ankan Basu
Gas Lift
 
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A video introducing gas-lift theory and technology used in artificial lift.
Views: 150213 Weatherford
Oil  and Gas  Wells--Start to Finish
 
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Oil and Gas Wells--Start to Finish - California Department of Conservation - DVD 2 - California Department of Conservation. Division of Oil, Gas, and Geothermal Resources. How oil and gas wells are drilled, produced, and abandoned. Surface and subsurface environmental concerns are described, including the protection of fresh waters and drilling in urban areas.
Views: 437675 PublicResourceOrg
Problems With the Water: Venturis and Braukmann Valves
 
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This video explains how to adjust the three existing venturis Aquatech may have installed, in your home, over the years (e.g. the hydrocharger, Mazzei injector, and current model of venturi), as well as how to adjust your Braukmann valve. For more information on Aquatech, and its line of water filtration and softening systems, visit http://www.aquatech-canada.ca, or call us at 1-800-265-0294 for a free water analysis.
Views: 301 Aquatech Canada
GeoThermal storage
 
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Invention presentation
Views: 326 Ahmed Fakhry
Mining, Energy & Infrastructure
 
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Mining played a major part in the early history of the Gulf and is likely to see significant developments in coming years. Most of the region lies partly within the North West Queensland Minerals Province. The North West Queensland Minerals Province, which extends to Queensland’s western border, is “recognised as one of the most prospective minerals resource areas in the world” and accounts for a considerable portion of the world’s production of copper, lead, zinc and silver and also contains phosphate, limestone and uranium deposits. For more information about investing in, living in and visiting the Gulf please go to www.gulf-savannah.com.au or download our app
Interactive Conversation on Grouting and Controlling Groundwater in Mines and Tunnels
 
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An interactive webinar detailing amenability theory and the differences between soil and rock grouting. The benefits of pozzolans in cement based suspension grouts are explored and a variety of case studies illustrate the benefits of solution (chemical) grouts.
Borewell Cleaning
 
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Cleaning of borewell with high pressure air
Views: 120432 Girish Shenoy
Conducting A Tracer Experiment in PeruCreek, Colorado
 
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CWEST Director, Diane McKnight, and INSTAAR graduate student, Jeff Wong, conduct a field experiment in an acid mine drainage stream to study how the creek transports metals from the mine throughout the waterway and into the ecosystem. The experiment involves injecting a conservative tracer, sodium chloride, into the creek.
Using Pneumatic Pressure to Generate a Sinusoidal Signal in a Well
 
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Learn how to improve groundwater characterization outcomes by using pneumatic pressure to generate a sinusoidal signal in a well. Michael Fort, principal at Hydroresolutions LLC, discusses the advantages of pneumatic slug testing over traditional slug tests, advantages of PneuSine signals, how to set up tests, and how to interpret data.
Views: 617 In-Situ
WEBINAR: Interactive Conversation on Controlling Groundwater in Mines, Tunnels, & Subways
 
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A collaborative presentation with speakers from ECO Grouting Specialists, US Grouting Specialists, US Grout, and Avanti International.
Views: 73 AvantiGrout
Stone termite - Drilling rig
 
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Stone termite is a remote controlled hydraulic crawler drill. A 5300 kg-machine can reach those drilling targets that big machinery can't. Stone termite crawler drill is an excellent solution for stepped excavation, bolting and vertical or horizontal drilling at construction sites, canals and natural stone quarries. Tracks provide rough terrain capabilities. Check out more information at our website: www.stonepower.fi
Views: 3335 Stonepower
Animation - How centrifugal pump works. ✔
 
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Our web site: http://www.techtrixinfo.com/ Plz Join Our Face Book Page:http://www.facebook.com/pages/TechTrixInfo/271447906234307 Our Android app in Google play: https://play.google.com/store/search?q=techtrixinfo&c=apps This video, explains about the working of a centrifugal pump with the help of a animation. We need your support to keep going: Please click like button, comment, share in social media, join our face book page http://www.facebook.com/pages/TechTrixInfo/271447906234307 or please bookmark our site www.techtrixinfo.com You can subscribe to us for more technical videos; thanks for your support have a great day. Related topics: centrifugal pump efficiency, centrifugal pump efficiency calculation, centrifugal pump experiment, centrifugal pump power equation, centrifugal pump head equation, centrifugal pump characteristics, centrifugal pump curve, centrifugal pump curve equation, centrifugal pump curve characteristics, centrifugal pump performance curve characteristics, centrifugal pump working principle, centrifugal pumping circuit, centrifugal pumping systems, centrifugal pump failure modes, centrifugal pump failure analysis, centrifugal pump failure causes, centrifugal pump components and functions, centrifugal pump commissioning procedure, centrifugal pump commissioning checklist, working of centrifugal pump animation, how centrifugal pump works, how centrifugal pump works animation, centrifugal pump animation, centrifugal force, centrifugal pump lecture, centrifugal pump overhauling, centrifugal pump operation, centrifugal pump design, centrifugal pump basics, centrifugal pump assembly, centrifugal pump working video, centrifugal pump working model, how deos centrifugal pump works, multistage centrifugal pump working, single stage centrifugal pump, single stage centrifugal pump working animation, working principle of centrifugal pump, Animation, how it works, Engineering explained, Mechanical engineering, Automobile engineering, engineering videos, engineering tutorials, how to repair, Engineering, Civil, electrical, electronics, repair, working of, failures, projects, seminars, technical, learning, how to make, pumps water pump vacuum pump pump submersible pump goulds pumps fuel pump water pumps hydraulic pump peristaltic pump impeller cri pumps well pump kirloskar pumps ksb pumps oil pump diaphragm pump vacuum pumps submersible pumps positive displacement pump gear pump booster pump sub pump irrigation pumps solar pump gould pumps trash pump centrifugal pumps centrifugal compressor reciprocating pump types of pumps concrete pump abs pumps ebara pumps hydraulic systems self priming pump screw pump vane pump piston pump water booster pump deep well pump solar pumps rotary pump crompton greaves pumps suction pump fire pump mini water pump jockey pump johnson pumps slurry pump pressure pump high pressure water pump monoblock pump march pump goulds pump metering pump mud pump johnson pump waterpump peristaltic pumps slurry pumps jet pumps high pressure pump dewatering pumps gear pumps industrial pumps water pumps for sale rocket engines plunger pump trash pumps pump manufacturers submersible pump price hand pumps drum pump prominent pumps dab pumps oil pumps irrigation pump dayton pumps rocket motors gorman rupp pumps electric oil pump lobe pump dc water pump chemical pumps sludge pump pump curves mag drive pumps booster pumps fire pumps
Views: 328841 TechTrixInfo
Expando saves the day, rock breaking with Chemical Cracking Agent
 
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Another rock removal job where the customer did not want to use explosives. This is a home site excavation where we had to deal with some hard Lilydale formation (Coldstream Rhyolite), this is a metamorphic rock - mudstone that has been baked. Generally an excavator mounted breaker is not very successful when trying to break up this stuff so we drilled it full of holes and filled it with "Expando". We came back in a few days with a small machine fitted with a breaker and rattled out the pieces.
Take Your Time To Choose Your Drilling Contractor
 
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Some of the services offered by a professional drilling contractor include aquifer storage and recovery wells. Large diameter production wells are routinely installed for agriculture and public water supply. Deep injection wells for disposal of treated domestic wastewater, plus chloride profile, monitor and other test wells also are a part of the stock. Environmental wells can be constructed to extract dangerous waste and to monitor the subsurface movement of hazardous waste plumes. Ground water monitoring Test hole drilling Product recovery Economic/irrigation water systems City well drilling, well fix/upkeep Turbine pump sales and service Civic pump systems and sales Geothermal systems Residential water systems Some of the services you can get from a drilling contractor include aquifer storage and recovery wells, which are a speciality of many companies. Huge diameter production wells are typically installed for farming and public water supply. Deep injection wells for disposal of treated domestic wastewater, and chloride profile, monitor and other test wells also are a part of the inventory. Environmental wells have been built to extract unsafe waste and to watch the subsurface movement of hazardous waste plumes. Sometimes it is easily worth seeking out a diversified rotary drilling organisation offering unique mud and air rotary drilling services to a range of industries. Service groups can include water supply, environmental, energy, mining, and pump services and rehabilitation. Drilling methods can include air hammer, air rotary, twin tube reverse air rotary, treble tube air rotary, odex-centris casing drivers, mud rotary, dual tube flooded reverse rotary, horizontal drilling and directional drilling services. A well established company can supply tooling for hole diameters from 5 inches to 60 inches, with depths beyond 5,000 feet. These services include environmental (monitoring, vapour extraction, rectification wells), water wells (domestic and massive diameter wells up to 30-inch diameter and 1,250 feet), geotechnical (SPT, soil survey, piezometer), construction (caissons up to 8-foot diameter, cathodic protection) and pump services (up to 600 Hp and 5,000 gpm, enormous production well systems, correction systems). The management and supervisory staff of many companies have a number of years of experience in the water well industry. In this situation they can frequently provide complete water well systems on a turnkey basis, offering the thorough range of services required to provide stylishly designed, constructed and maintained municipal and industrial water wells. These contractors will also occasionally have the capability to provide every component of a water well system, including test hole drilling, well casing and screen selection and installation, gravel packing, grout sealing, well development and testing, pump selection, and equipment sales and installation. If you select wisely, you'll almost surely get your drilling work done exactly as you hope for. Article Source: http://www.phoenixrealestatesecrets.com/az/2012/10/03/take-your-time-to-choose-your-drilling-contractor/ Image Source: http://www.onlineconcrete.com.au/CoreDrilling.html
Views: 201 zurich gabriel
Natural gas storage
 
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Natural gas, like many other commodities, can be stored for an indefinite period of time in natural gas storage facilities for later consumption. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 98 Audiopedia
Mod-09 Lec-39 Microbial geotechnology and Ground Improvement
 
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Ground Improvement Techniques by Dr. G.L. Sivakumar Babu, Department of Civil Engineering, IISc Bangalore. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 9306 nptelhrd
Geothermal energy
 
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Geothermal energy is thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radioactive decay of minerals (80%). The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. The adjective geothermal originates from the Greek roots γη (ge), meaning earth, and θερμος (thermos), meaning hot. Earth's internal heat is thermal energy generated from radioactive decay and continual heat loss from Earth's formation. Temperatures at the core--mantle boundary may reach over 4000 °C (7,200 °F). The high temperature and pressure in Earth's interior cause some rock to melt and solid mantle to behave plastically, resulting in portions of mantle convecting upward since it is lighter than the surrounding rock. Rock and water is heated in the crust, sometimes up to 370 °C (700 °F). This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 604 Audiopedia
Shale gas
 
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Shale gas is natural gas that is found trapped within shale formations. Shale gas has become an increasingly important source of natural gas in the United States since the start of this century, and interest has spread to potential gas shales in the rest of the world. In 2000 shale gas provided only 1% of U.S. natural gas production; by 2010 it was over 20% and the U.S. government's Energy Information Administration predicts that by 2035, 46% of the United States' natural gas supply will come from shale gas. Some analysts expect that shale gas will greatly expand worldwide energy supply. China is estimated to have the world's largest shale gas reserves. A study by the Baker Institute of Public Policy at Rice University concluded that increased shale gas production in the US and Canada could help prevent Russia and Persian Gulf countries from dictating higher prices for the gas they export to European countries. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 91 Audiopedia
mobile clusher for hire tanzania
 
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More Details : http://wwa.stonecrushersolution.org/solutions/solutions.html Seneca Home of Crushing and Screening Seneca Crushing & Screening, managed by a young, Mobile Crusher Hire. Seneca hires out mobile crushing and screening equipment as per client requirements. Read more tanzania quary mobile crusher for hire – Grinding Mill mobile crushers for hire in india - Tanzania Crusher. Tanzania Crushermobile crushing plantmobile mobile crushers for hire in india,Shanghai is a professional ore crusher including less quarry Read more Mobile Screening & Crushing MSC NZ Sales Hire MSC NZ Ltd specialises in the sales & hire of Mobile Screeners, Mobile Crushers, Mobile & Static Trommels and customised Recycling systems. NZ-wide. Read more tanzania quary mobile crusher for hire - teratop.eu tanzania quary mobile crusher for hire . Impact Crusher South Africa. mini mobile crushers for sale in south . africa, South africa . very promising, Read more mobile clusher for hire tanzania Tanzania query mobile crusher for hire . Mobile Crusher Hire Hiring the mobile mini Crusher 5000 Series from BSP Construction allows We hire out mobile crushing and tanzania quary mobile crusher for hire; Read more mobile crusher in oman tanzania - macimpianti.eu 2016 10 28 crusher plant jobs in oman austin in. quarry business for sale in oman cost of appolo mobile crusher in tanzania process plant mobile crusher hire. Read more mobile crusher hire in india - tobien.eu mobile crusher hire tanzania. mobile crusher hire tanzania grinding mill equipmentmobile crushers for hire in india Tanzania Crushermobile crushers for hire Read more Plant Hire Mobile Jaw Crusher South Africa Stone mobile crusher plant for hire in south africa AGREEMENT FORMAT FOR MOBILE CRUSHER HIRE. Nov 14, 2016· Tanzania stone Read more mobile crushing plant - Tanzania Crusher mobile crushers for hire in india High Efficiency Crushing Plant As the world leader in rock and minerals processing, has pioneered the development of track-mounted, fully mobile crushing plants. Read more Mobile crushing Plant For Hire africa - smart-university.eu Industry News. mobile crusher hire in south africa. mobile crusher hire in south africamore mobile crusher hire in south africa mobile tanzania cement grinding Read more tanzania quary mobile crusher for hire - sancarlohotel.eu mobile stone crushing plant cost Johannesburg tanzania. tanzania quary mobile crusher for hire Grinding Mill China. Tanzania Crushermobile crushing plantmobile tanzania quary mobile crusher for also known Read more Mobile Jaw Crushers for Hire - Bost Group Bost Group can help you to maximise your productivity & reduce downtime costs by offering competitive rates on dry hire of Mobile Crushing & Screening Equipment and Earthmoving Machinery - customised to your operation & Read more Mobile Clusher For Hire Tanzania - bbpi.eu Mobile Stone Crushing Plant Tanzania - canei. mobile clusher for hire tanzania. mobile clusher for hire tanzania. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, . Read more mobile clusher for hire tanzania mobile clusher for hire tanzania. African Encounter - Tanzania. Tanzania. Tanzania is one of the most beautiful countries in the continent of Africa. Read more mobile crushers for hire in india - Tanzania Crusher mobile crushers for hire in india,Shanghai is a professional ore crusher equipment,mobile crushers for hire in india, mechanical beneficiation equipment, ore milling equipment manufacturers.Ore mining process, the first belt conveyor, vibrating feeder, conveyor equipment ore sent to the jaw crusher, impact crusher, hydraulic crusher Read more mobile crushing plant - Tanzania Crusher mobile crushers for hire in india High Efficiency Crushing Plant As the world leader in rock and minerals processing, has pioneered the development of track-mounted, fully mobile crushing plants. Read more Mobile Crusher Hire Tanzania - art-de-pierre.eu Mobile Crusher Hire Tanzania . mobile limestone cone crusher for hire in south africa. mobile limestone crusher for hire south africa
Views: 1 Hester Cochran
Mod-09 Lec-38 Sustainable development and energy geotechnology
 
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Ground Improvement Techniques by Dr. G.L. Sivakumar Babu, Department of Civil Engineering, IISc Bangalore. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 761 nptelhrd
8 8 through 8 9
 
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Views: 19 Melissa Schlegel
Science and technology of the Han dynasty | Wikipedia audio article
 
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This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Science_and_technology_of_the_Han_dynasty 00:04:12 1 Modern perspectives on science and technology during Han 00:06:55 2 Writing materials 00:09:02 3 Ceramics 00:11:42 4 Metallurgy 00:11:52 4.1 Furnaces and smelting techniques 00:14:09 4.2 Use of steel, iron, and bronze 00:15:59 5 Agriculture 00:16:08 5.1 Tools and methods 00:17:28 5.2 Alternating fields 00:20:13 5.3 Pit fields 00:21:33 5.4 Rice paddies 00:22:37 6 Mechanical and hydraulic engineering 00:22:48 6.1 Literary sources and archaeological evidence 00:27:47 6.2 Uses of the waterwheel and water clock 00:30:31 6.3 Seismometer 00:33:34 7 Mathematics and astronomy 00:33:44 7.1 Mathematical treatises 00:35:33 7.2 Innovations in the treatises 00:37:45 7.3 Approximations of pi 00:39:38 7.4 Musical tuning and theory 00:39:48 7.5 Astronomical observations 00:41:09 7.6 Han calendars 00:42:10 7.7 Astronomical theory 00:43:41 8 Structural engineering and public works 00:46:55 8.1 Materials and construction 00:48:58 8.2 Courtyard homes 00:51:41 8.3 Chang'an and Luoyang, the Han capitals 00:51:52 8.4 Underground tombs 00:54:03 8.5 Boreholes and mining shafts 00:55:06 8.6 Ceramic model buildings 00:58:52 8.7 Roads, bridges, and canals 01:01:22 9 Medicine 01:02:49 10 Cartography 01:06:12 11 Nautics and vehicles 01:09:56 12 Weaponry and war machines 01:14:03 13 See also 01:17:22 14 Notes 01:21:14 15 References 01:22:58 16 External links Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. Listen on Google Assistant through Extra Audio: https://assistant.google.com/services/invoke/uid/0000001a130b3f91 Other Wikipedia audio articles at: https://www.youtube.com/results?search_query=wikipedia+tts Upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts Speaking Rate: 0.8979408224315483 Voice name: en-US-Wavenet-B "I cannot teach anybody anything, I can only make them think." - Socrates SUMMARY ======= The Han dynasty (206 BCE – 220 CE) of ancient China, divided between the eras of Western Han (206 BCE – 9 CE, when the capital was at Chang'an), Xin dynasty of Wang Mang (r. AD 9–23), and Eastern Han (25–220 CE, when the capital was at Luoyang, and after 196 CE at Xuchang), witnessed some of the most significant advancements in premodern Chinese science and technology. There were great innovations in metallurgy. In addition to Zhou-dynasty China's (c. 1050 – 256 BCE) previous inventions of the blast furnace and cupola furnace to make pig iron and cast iron, respectively, the Han period saw the development of steel and wrought iron by use of the finery forge and puddling process. With the drilling of deep boreholes into the earth, the Chinese used not only derricks to lift brine up to the surface to be boiled into salt, but also set up bamboo-crafted pipeline transport systems which brought natural gas as fuel to the furnaces. Smelting techniques were enhanced with inventions such as the waterwheel-powered bellows; the resulting widespread distribution of iron tools facilitated the growth of agriculture. For tilling the soil and planting straight rows of crops, the improved heavy-moldboard plough with three iron plowshares and sturdy multiple-tube iron seed drill were invented in the Han, which greatly enhanced production yields and thus sustained population growth. The method of supplying irrigation ditches with water was improved with the invention of the mechanical chain pump powered by the rotation of a waterwheel or draft animals, which could transport irrigation water up elevated terrains. The waterwheel was also used for operating trip hammers in pounding grain and in rotating the metal rings of the mechanical-driven astronomical armillary sphere representing the celestial sphere around the Earth. The quality of life was improved with many Han inventions. The Han Chinese had hempen-bound bamboo scrolls to write on, yet by the 2nd century CE had invented the papermaking process which created a writing medium that was both cheap and easy to produce. The invention of the wheelbarrow aided in the hauling of heavy loads. The maritime junk ship and stern-mounted steering rudder enabled the Chinese to venture out of calmer waters of interior lakes and rivers and into the open sea. The invention of the g ...
Views: 16 wikipedia tts
Nuclear Power and Bomb Testing Documentary Film
 
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The Waste Isolation Pilot Plant, or WIPP, is the world's third deep geological repository (after closure of Germany's Repository for radioactive waste Morsleben and the Schacht Asse II Salt Mine) licensed to permanently dispose of transuranic radioactive waste for 10,000 years that is left from the research and production of nuclear weapons. It is located approximately 26 miles (42 km) east of Carlsbad, New Mexico, in eastern Eddy County. In order to address growing public unrest concerning construction of the WIPP, the New Mexico Environmental Evaluation Group (EEG) was created in 1978. This group, charged with overseeing the WIPP, verified statements, facts, and studies conducted and released by the DOE regarding the facility. The stewardship this group provided effectively lowered public fear and let the facility progress with little public opposition in comparison to similar facilities around the nation such as Yucca Mountain in Nevada. The EEG, in addition to acting as a check for the government agencies overseeing the project, acted as a valuable advisor. In a 1981 drilling, pressurized brine was again discovered. The site was set to be abandoned when the EEG stepped in and suggested a series of tests on the brine and the surrounding area. These tests were conducted and the results showed that the brine deposit was relatively small and was isolated from other deposits. Drilling in the area was deemed safe due to these results. This saved the project valuable money and time by preventing a drastic relocation. In 1979 Congress authorized construction of the facility. In addition to formal authorization, Congress redefined the level of waste to be stored in the WIPP from high temperature to transuranic, or low level, waste. Transuranic waste often consists of materials which have come in contact with radioactive substances such as plutonium and uranium. This often includes gloves, tools, rags, and assorted machinery often used in the production of nuclear fuel and weapons. Although much less potent than nuclear reactor byproducts, this waste still remains radioactive for approximately 24,000 years. This change in classification led to a decrease in safety parameters for the proposed facility, allowing construction to continue at a faster pace. The first extensive testing of the facility was due to begin in 1988. The proposed testing procedures involved interring samples of low level waste in the newly constructed caverns. Various structural and environmental tests would then be performed on the facility to verify its integrity and to prove its ability to safely contain nuclear waste. Opposition from various external organizations delayed actual testing into the early 1990s. Attempts at testing were resumed in October 1991 with US Secretary of Energy James Watkins announcing that he would begin transportation of waste to the WIPP. Despite apparent progress on the facility, construction still remained costly and complicated. Originally conceptualized in the 1970s as a warehouse for waste, the repository now had regulations similar to those of nuclear reactors. As of December 1991, the plant had been under construction for 20 years and was estimated to have cost over one billion dollars. At the time, WIPP officials reported over 28 different organizations claiming authority over operations of the facility. In November 1991, a federal judge ruled that Congress must approve WIPP before any waste, even for testing purposes, was sent to the facility. This indefinitely delayed testing until Congress gave its approval. The 102nd United States Congress passed legislation allowing use of the WIPP. The House of Representatives approved the facility on October 6, 1992 and the Senate passed a bill allowing the opening of the facility on October 8 of the same year. The bill was met with much opposition in the Senate. Senator Richard H. Bryan fought the bill based on safety issues that concerned a similar facility located in Nevada, the state for which he was serving as senator. His efforts almost prevented the bill from passing. New Mexico senators Pete V. Domenici and Jeff Bingaman effectively reassured Senator Bryan that these issues would be addressed in the 103rd Congress. The final legislation provided safety standards requested by the House and an expedited timeline requested by the Senate. http://en.wikipedia.org/wiki/Waste_Isolation_Pilot_Plant
Views: 632126 The Film Archives
Timeline of United States inventions (1890–1945) | Wikipedia audio article
 
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This is an audio version of the Wikipedia Article: Timeline of United States inventions (1890–1945) Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. You can find other Wikipedia audio articles too at: https://www.youtube.com/channel/UCuKfABj2eGyjH3ntPxp4YeQ You can upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts "The only true wisdom is in knowing you know nothing." - Socrates SUMMARY ======= A timeline of United States inventions (1890–1945) encompasses the ingenuity and innovative advancements of the United States within a historical context, dating from the Progressive Era to the end of World War II, which have been achieved by inventors who are either native-born or naturalized citizens of the United States. Copyright protection secures a person's right to his or her first-to-invent claim of the original invention in question, highlighted in Article I, Section 8, Clause 8 of the United States Constitution which gives the following enumerated power to the United States Congress: In 1641, the first patent in North America was issued to Samuel Winslow by the General Court of Massachusetts for a new method of making salt. On April 10, 1790, President George Washington signed the Patent Act of 1790 (1 Stat. 109) into law which proclaimed that patents were to be authorized for "any useful art, manufacture, engine, machine, or device, or any improvement therein not before known or used." On July 31, 1790, Samuel Hopkins of Philadelphia, Pennsylvania, became the first person in the United States to file and to be granted a patent under the new U.S. patent statute. The Patent Act of 1836 (Ch. 357, 5 Stat. 117) further clarified United States patent law to the extent of establishing a patent office where patent applications are filed, processed, and granted, contingent upon the language and scope of the claimant's invention, for a patent term of 14 years with an extension of up to an additional 7 years.From 1836 to 2011, the United States Patent and Trademark Office (USPTO) has granted a total of 7,861,317 patents relating to several well-known inventions appearing throughout the timeline below. Some examples of patented inventions between the years 1890 and 1945 include John Froelich's tractor (1892), Ransom Eli Olds' assembly line (1901), Willis Carrier's air-conditioning (1902), the Wright Brothers' airplane (1903), and Robert H. Goddard's liquid-fuel rocket (1926).
Views: 133 wikipedia tts