Рет қаралды 95,944
Circa Late 1800, early 1900. Made by Manufacturers and Inventors Electric Co NY. Cool little devise presumably for telegraph linemen to test the lines for Morse code signal strength. Friend lent this to me to figure out and make it work again. 4 Volts seems to make if function just fine.
I got information on it by posting on FB and got a great response from
Chris Farley thank you!
Also a bit of info on these sites:
americanhistory.si.edu/collec...
www.telegraphkeys.com/pages/so...