This unusual apparatus
is a coherer connected to an electromagnet. When the
coherer detects a radio pulse, the magnet pulls the
trigger of a cap gun, producing a loud report. This
device is believed to be modeled after Marconi's
experiments where a gun was used to signal successful
reception of a signal transmitted from out of view.
AWA P1 Wireless Receiver
1919 Click Click here
to see the entire AWA spark gap receiver and transmitter
Independent Wireless Telegraph A-1
c. 1915
Marconi 16
1915 Carborundum crystal receiver designed to be
insensitive to vibration
Carborundum crystal receiver designed to be insensitive
to vibration
Wireless Specialty Apparatus Co.
Long Wave Loading Unit
1920 Used with IP501A Receiver
Western Electric SCR-68
1918
United Wireless Telegraph Co.
Model D Tuner
1907-1912
Western Electric SCR 59
1917
Another very early Signal Corp receiver,
designed for use in WWI aircraft. Click on the image to see a larger
version
Deforest BC14A
1917 The BC14A was designed for use as an artillery
spotting receiver during WW1. The
BC14A was designed for use as an artillery spotting
receiver during WW1.
Westinghouse SCR 70
1917 Rare early Signal Corp communication receiver
designed by Frank Conrad. Conrad is considered by many
to be the father of commercial radio broadcasting.
Unmarked Early Two-Valve Receiver
(British)
National Electrical Supply
SE 1387 RF Driver
International Radio &
Telegraph Co.
Vacuum Tube Tuner
