Alexanderson Radio Alternator

"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. These machines, developed during the period 1904 to 1918, were used in research on high-frequency properties of materials as well as for international communications." (This plaque can be viewed at the General Electic Company, at 1 River Road in Schenectady, New York.) The development of the Alexanderson 200kW transmitter was a major breakthrough for wireless communication and was responsible for: The formation of the first American controlled important wireless communication company, the Radio Corporation of America, in 1919. Dependable day and night wireless contact with our allies in WWI by way of the Navy operated American Marconi station at New Brunswick, NJ. Our only reliable contact with Germany towards the end of WW1 as Germany's cables had been cut. RCA setting up a worldwide communication system that superseded British Marconi's "Imperial Chain" of 300 kW timed spark transmitters. In 1904 Reginald Fessenden ordered from General Electric a unit to generate AC at a frequency of 100 kHz. This order was given to E.F.W. Alexanderson to design. He has joined the A.C. Engineering Department of General Electric in 1902.

GE Re-entry Systems

Anonymous — Wed, 25 Jul 2012 07:39:20 +0000

GE Re-entry Systems

(not verified) Wed, 07/25/2012 - 03:39

Society

Main Category

Sub Category

Era

Date Created

Location Country

Coordinates

39.953801, -75.187437

Address1

3198 Chestnut Street

City

Philadelphia

State

Country

USA

Website

https://www.aiaa.org/uploadedFiles/About-AIAA/Governance/GovernanceDocs/AnnualR…

From 1956 to 1993, the GE Re-entry Systems facility was home to thousands of engineers and technicians who solved the problem of vehicles successfully reentering the Earth’s atmosphere. As described by aerospace pioneer Theodore Von Karman, “ Reentry… is perhaps the most difficult problem one can imagine.” Whether it was the first operational reentry vehicle for the Atlas ICBM, the recovery of the first man-made object from orbit, or the first probe to enter Jupiter’s atmosphere, some of the most significant milestones in aerospace were accomplished by those working in this facility. GE Re-entry Systems achievements also include the first operational ablation reentry vehicle and longest reentry system flight in the world (9000 miles — Atlas Mk 3); the largest operational U.S. Reentry vehicle (Titan II Mk 6); and the first multiple independently targetable reentry vehicle weapon system (Minuteman III).