1937 NBS (NIST) publication on radio

NBS Circular C74 is a technical blast form the past! Originally issued in 1918 and finally updated in 1937, this circular was in response to Hiram Percy Maxim and other Amateurs interested in this newfangled invention called “radio”. While technology has moved on, the roots remain and are a fascinating glimpse into the 100 year history of Amateur Radio.

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