The history of the use of controlled electron flow and electromagentic radiation for purposes other than the transmission of energy.
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Describes facts behind the development of CRT, Roentgen, camera tubes. Includes background information of Crookes, Geissler and Ruhmkorff. Includes photos of antique models.
Explains the process that two companies went through to develop and finally mass produce some of first battery radios in the early 1950's. Features photos of the new product and early circuit design [pdf]. Includes history by Regency co-founder John Pies and related web links.
Describes facts behind the development of CRT, Roentgen, camera tubes. Includes background information of Crookes, Geissler and Ruhmkorff. Includes photos of antique models.
Explains the process that two companies went through to develop and finally mass produce some of first battery radios in the early 1950's. Features photos of the new product and early circuit design [pdf]. Includes history by Regency co-founder John Pies and related web links.
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- Recently edited by merlin1
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