J - Telegraph key

• J-1, M1915 for SCR-49
• J-2, on mounting base ? SCR-49
• J-3, adjustable, folding, SCR-71
• J-4, silent, for instruction
• J-5, flame proof, TM-8 terminal, and base for aircraft.
• J-6, adjustable, open gap, aircraft
• J-7, adjustable, flame proof, winker lamp socket, aircraft
• J-8 ?
• J-9, ?
• J-10, on radio tractor set ?
• J-11, flameproof, silent, for instruction.
• J-12, adjustable , high speed.
• J-13, ?
• J-14, adjustable, folding, 6-ohm resistor, BC-47
• J-15, legless; Brunnell type, EE-15 buzzer
• J-16, strap unmounted, EE-10 signal lamp
• J-17, flashing, strap, unmounted,
• J-18, open circuit telegraph, EE-21
• J-19, telephone, 2-way,
• J-20, telephone, double pole, single throw, switch box BC-95
• J-21, strap, (Key Strap large)
• J-22, strap, (Key strap small)
• J-23, wireless telegraph, M1911,
• J-24, oil break, (oil break wireless telegraph key)
• J-25, radio sending key, SCR-41
• J-26, radio telegraph, McKinney type,
• J-27, radio telegraph, McKinney type, marine wireless sets
• J-28, open circuit , leg,
• J-29, closed circuit, leg,
• J-30, closed circuit legless,
• J-31, combination, leg,
• J-32, open circuit, legless,
• J-33, open circuit, legless,
• J-34, flashing type, for EE-6 signal lamp.
• J-35, flashing type, BC-81, EE-7

(NOTE 1920 storage catalog ends here)

• J-36, Vibroplex "Lightning Bug
• J-37, general purpose open circuit (no closing switch) radio key; it was used on the BC-148, on the control box BC-177,
• J-38, Morse Code training key, EE-81, EE-95
• J-39
• J-40, fastens to operators leg, 1933 - Radio; open circuit; part of Radio Sets SCR-177-B AND SCR-245-D.
• J-41, for TG-5 telegraph set
• J-42, ?
• J-43, J-37 on an engraved Bakelite base. It has a toggle switch which connects the contact to a "relay" terminal.
• J-44, used with radio sets SCR-178 and SCR-179 (BC-187). It is composed of a J-37 on an engraved Bakelite base. It has a slide switch marked "voice" and "tel"
• J-45, leg clamp.
• J-46, strap key on a 2 x 4 inch Bakelite base. It was part of the WWII Signal Corps EE-84 portable field signal lamp set
• J-47, radio key (no circuit closer) on bakelite base EE-80
• J-48,for BC-654 receiver-transmitter (part of SCR-284).
• J-49,
• J-50
• J-51, hand squeeze telegraph key (sometimes called a "scissors key"). SE-11
• J-52
• J-53
• J-54
• J-55
• J-56
• J-57
• J-58
• J-59
• J-60

References

signal corps museum, article. File:Telegraph key.pdf