Browse Items (13 total)

Collage of different uses of radio world.

he first amateur superheterodyne receiver, an illustration for a do-it-yourself article in a 1920 amateur radio magazine. The superheterodyne circuit on which virtually all modern receivers are based was invented in 1918 during World War 1 by Edwin…

Young child listening to a radio, 1920-1930. Young child with a set of earphones listening to a radio. The child and the radio sit on a table on a verandah. Part of the verandah balustrade can be seen to the left.

A woman, Florence Violet McKenzie, sitting at a desk listening to an early radio in 1922. Radio broadcasting, which began around the time this picture was taken, caused radio listening to explode from a high-tech hobby to a hugely popular pastime…

1920s TRF radio manufactured by Signal Electric MFG. CO. located in Menominee Mich. Demonstrates early radio construction methods using "breadboard

Photo of an American family in the 1920s listening to a crystal radio. From a 1922 advertisement for Freed-Eisemann radios in Radio World magazine. The small radio is on the table. Crystal sets work off the power received from radio waves, so they…

English: Farmer in 1923 listening to crop reports broadcast from Washington D.C. using a crystal radio. The early crystal radio had a "cat whisker detector" consisting of a fine wire on an adjustable arm that touched the surface of a crystal of the…

A drawing of an early vacuum tube regenerative radio receiver and horn loudspeaker, the Paragon receiver, made by Adams-Morgan Co., Montclair, New Jersey, USA, from an advertisement in a radio magazine around 1922. The radio consists of two units;…

A "radiophone dance" held by an Atlanta social club in May 1920 in which the participants danced wearing earphones to music transmitted from a band across town. Practical AM radio transmission of sound was made possible by the development of vacuum…

Newspapers extolled the virtues of how radio would serve the public.