Automatic Morse Code Transmitter - Made for the National Radio Institute Washington D.C.
(this is a gift from my good friend Alberto, www.roverjoe.com)
Instructograph was produced from the 1920s ! Instructographs were used by
many thousands of would-be telegraph operators to learn and increase their
code-copying ability. The original version shown uses a hand-wound spring
driven motor with a centrifugal governor and were supplied with American
Morse Code paper tapes with short holes for dots and long holes for dashes.
Later models used electric motor drives and included a battery powered and
later AC line powered oscillator to produce tones for training radio
operators. The manual says "if one cannot learn to become a skilled operator
with the consistent use of the machine and instruction, they had as well
give up the idea" (circa 1930).
Thanks to www.9h1pi.com for info.