At the risk of telling everybody something they already know, the
Tonschreiber had a wide range of capstan speed to facilitate its purpose in
life, which was to protect U-boats from the Allies' Huff-Duff detection
apparatus. This, using two orthogonal antennae and a Lissajous display,
could generate a practically instant fix from a U-boat transmission. The
solution adopted was to record Morse at slow speed, replay at high speed to
keep the transmission as short as possible and restore pitch with the
----- Original Message -----
From: "Shai Drori" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, November 04, 2009 7:08 AM
Subject: Re: [ARSCLIST] power line frequency
> The solution is very simple. The capstan of the Tonschreiber did not run
> off the incoming AC but had an oscillator and amplifier as a servo. It
> could run at any speed from I think 9 to 130 cm/sec.
> Richard L. Hess wrote:
>> At 07:09 PM 2009-11-03, you wrote:
>>> From: Patent Tactics, George Brock-Nannestad
>>> The story continues. I would not be surprised to learn that northern
>>> records were cut with machines run off 14 Hz or 16 2/3 Hz, which were in
>>> for traction purposes. Let us see if a type-wri-toon will work here:
>>> ;-) -
>>> yes, it did.
>> Hi, George,
>> One thing that intrigued me is that the Tonschreiber version of the
>> Magnetophon which was analyzed in depth after WWII by some Army Engineers
>> who appeared to do a good job apparently could work from 25-60 Hz.
>> Richard L. Hess email: [log in to unmask]
>> Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
>> Detailed contact information: http://www.richardhess.com/tape/contact.htm
>> Quality tape transfers -- even from hard-to-play tapes.