1904
YearAdded:
Image Credit:
Public domain
Image Caption:
The second prototype of a track-type tractor built by the Holt Machinery Company of Stockton, California in 1905.
Era_date_from:
1982
On this 84-acre meadow in 1904 and 1905, the Wright Brothers successfully mastered the mechanics of controlled, powered, heavier-than-air flight. The brothers also built the world’s first airport here, and in 1910 the Wright Company School of Aviation established a flying school on the site and trained many of the world’s first pilots, including some of the first military pilots, such as Thomas DeWitt Milling.
YearAdded:
Image Credit:
public domain
Image Caption:
Orville Wright in flight above Huffman Prairie, covering a distance of approximately 1,760 feet in 40 1/5 seconds, Nov. 16, 1904
Era_date_from:
"The Alexanderson radio alternator was a high-power, radio-frequency source which provided reliable transoceanic radiotelegraph communication during and after World War I. Ernst F.W. Alexanderson (1878-1975), a General Electric engineer, designed radio alternators with a frequency range to 100 kHz and a power capability from 2 kW to 200 kW.
YearAdded:
Image Credit:
Public Domain; Produced prior to 1/1/1923
Image Caption:
Alexanderson Radio Alternator
Era_date_from:
1904
1992
Opened July 9, 1904, this lift lock is the highest of its type in the world, transferring boats between two water levels in a single 19.8 m (65 ft.) lift. Designed in place of conventional locks, which would have lengthed the time considerably to transverse a gradual drop, this lift lock was a unique solution made feasible. It operates on a balance principle. Each boat chamber is supported by a ram, 2.28 m (7.5 ft.) In diameter. These move up and down inside water-filled cylinders connected by a pipe.
YearAdded:
Image Credit:
Courtesy Flickr/Mac Armstrong (CC BY-SA 2.0)
Image Caption:
Peterborough Hydraulic Canal Lift Lock
Era_date_from:
1904
1999
Plans to build a rapid transit system in New York were first made in 1831. By 1868 the first elevated railway was erected. As the "El" became crowded, construction of an underground railway was proposed. Ground was broken on March 24, 1900. The original subway, which took opened October 27, 1904, ran 9.1 miles from City Hall to 145th Street and Broadway. The fare was a nickel. Extensions to the Bronx opened in 1905 and to Brooklyn in 1908, completing the first subway.
YearAdded:
Image Credit:
Courtesy Wikipedia/Adam E. Moreira (CC BY-SA 3.0)
Image Caption:
Interborough Rapid Trasit System Original Line
Era_date_from:
1904
1978
Innovations
Plans to build a rapid transit system in New York were first made in 1831. By 1868 the first elevated railway was erected. As the "El" became crowded, construction of an underground railway was proposed. Ground was broken on March 24, 1900. The original subway, which took opened October 27, 1904,… Read More
Opened July 9, 1904, this lift lock is the highest of its type in the world, transferring boats between two water levels in a single 19.8 m (65 ft.) lift. Designed in place of conventional locks, which would have lengthed the time considerably to transverse a gradual drop, this lift lock was a…
Read More
"The Alexanderson radio alternator was a high-power, radio-frequency source which provided reliable transoceanic radiotelegraph communication during and after World War I. Ernst F.W. Alexanderson (1878-1975), a General Electric engineer, designed radio alternators with a frequency range to 100 kHz… Read More
On this 84-acre meadow in 1904 and 1905, the Wright Brothers successfully mastered the mechanics of controlled, powered, heavier-than-air flight. The brothers also built the world’s first airport here, and in 1910 the Wright Company School of Aviation established a flying school on…
Read More
