Telephone buildings in the past and the present in the United States. Pictures showing the Bell System telephone buildings in the past. A large number of present day buildings in which beauty and efficiency are maintained. View of telephone buildings in Cleveland, St.Louis, San Francisco and New York in 1926.
How Edison batteries function. The are also known as nickel-iron battery or NiFe batteries. An animated diagram shows how nickel iron alkaline storage batteries such as Edison batteries store and generate energy. The diagram shows the battery, generator, switch, motor, and a light bulb. An early nickel-iron Edison battery in wooden box. A later version of the nickel-iron battery invented by Thomas A. Edison in 1909. Pie chart showing the market share of Edison batteries over other portable batteries in 1926. Photograph of German-born American mathematician and electrical engineer Dr. Charles Proteus Steinmetz, "The Wizard of Schenectady". Slate bearing a commentary on from Dr. Steinmetz claiming "complete reversibility" of the Edison battery reaction. Diagram shows the reversible cycle of a portable battery. Animation in the diagram shows how energy is stored in the battery- the oxygen contained in the negative plate is forced to the positive plate by the charging current. The animation demonstrates the discharge of the battery. Plates from used Edison batteries show little decay after years of use.
Spectators watch the 1938 Massachusetts Handicap horse race at Suffolk Downs in Boston, Massachusetts. Jockeys takes their horses to starting point. Race starts and jockeys race on their horses. The race is won by Menow, a 10-to-1 shot, ridden by jockey, Nick Wall. (Note: The race was expected to feature the much-anticipated meeting of Seabiscuit and War Admiral, but Seabiscuit is scratched due to an injury just minutes before the race is scheduled to take place, much to the dismay of the record crowd that had gathered. War Admiral finished fourth in this race. This would help set the stage for the famed match race between the two champions that is ultimately held at Pimlico in Baltimore, MD later that year.)
A hoop roll race in Wellesley, Massachusetts. A sign formed on the grounds by the girls of the University of Massachusetts reads ' 930'. The girls in their graduation robes ready for the hoop roll race. The girls roll their hoops to a chapel. The winner is presented a bouquet.
The Massachusetts Handicap horse race at Suffolk Downs in Boston, Massachusetts. Spectators in the stands. The horses moving towards the starting point. The spectators cheer. The race starts. The horses running on the race track. The spectators watching the race. Seabiscuit wins the race.
Technicians and members in the laboratories and offices of WADC, Dayton, Ohio, United States. Aerial view of approach to Wright Air Development Center (Wright-Patterson Air Force Base), includuing view of Wright Memorial on Wright Brothers Hill. Low altituide aerial view of Aero Medical Laboratory, wind tunnel area, static structural tent building and the main flight line area. Hand holding book entitled, "Wright Air Development Center" (WADC). Hands open book-on first page is: "Mission of WADC". Interior, laboratory research building at Massachusetts Institute of Technology (MIT), airmen push rack down test area and into vault. Exterior view in Cambridge Massachusetts of the MIT Great Dome and Building 10 seen from Killian Court, with text engraving seen on building frieze: Massachusetts Institute of Technology. Two members of the Institute walk down steps of Building 10. Two technicians working in office building. Supersonic propeller undergoing test on large test stand. Superimposed over this picture are the words: Research And Development. Supersonic propeller undergoing tests. Two technicians at control panel of the test stand. USAF B-50 Superfortress aircraft in flight. Engine starting on B-50 in flight-plane equipped with special deicing equipment. B-50 in flight showing special test and research instruments and operator.
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