[GreenKeys] Teleplex

[Alf Fisher]

Hi Vladimir,
I noticed some Morse character holes were punched in the paper tape so my guess is it is a spring driven machine to learn Morse code.
I tried to read the information on the label but its not clear.  Perhaps a better close-up photo would help.
I found a picture on the internet that looks the same - http://www.n4mw.com/cp234.htm.

I also found this piece of text which might be relevant:

Teleplex Co., New York City.  First ad in QST seen Apr. 1927: 
"The Easy Way to Learn the Code Cuts Learning Time in Half.  The famous Teleplex for self-instruction at home.  The quickest, easiest and most economical way of learning Morse or Continental... Faithfully reproduces actual sending of expert operators."  Next month's ad: "At last! The Famous Teleplex ... with only a screw to turn.... 5 to 80 words per minute." Third month: "Learn the Code at Home This Easy Way With Teleplex.  Complete course ..."  They provided a code instruction manual and help and advice personally by correspondence. It was initially a spring-driven punched paper tape machine.  Later models were electric-motor driven.  In 1942 they produced a paper tape model which could record one's own sending (using electro-chemical means) as well as send user-prepared tapes.  In 1956 they reverted to punched tape again, and in 1959 they went to a machine resembling the Omnigraph.  Prices never published in ads.  The Teleplex Company later brought out an inked paper tape type of mechanical keyer, which was available for several years.  It used the sidewise motion of a pen with a conducting ink (apparently made from a silver compound), and was followed by a similar mechanical design using a chemically treated paper tape.  The user could make his own recordings with a key or from a receiver.  Playback was by a pair of spring-loaded fingers which contacted the conducting ink to close the circuit.  Later designs used a photocell instead of direct electrical contact for reading the tapes.  This permitted the use of non-conducting inks.  These differed only in degree from Morse's original "recorder." McElroy's company also manufactured this type of recording system.  These types of systems were generally far beyond the average ham's pocketbook. 

Regards,
Alf



From: Vladimir Romanov 
Sent: Tuesday, April 04, 2017 8:47 AM
To: greenkeys at mailman.qth.net 
Subject: [GreenKeys] Teleplex

Hello, 

Can someone tell me what is this?


Thank you

Vladimir


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