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Speed error recorder
- not in collection
T-lab-340 was a speed error recorder (German: Drehzahlfehlerschreiber)
for 5-level
teleprinter signals (telex),
developed around 1943 by Siemens & Halske
in Germany. It was intended for the alignment of Siemens (and other)
teleprinters,
and featured a HELLSCHREIBER
paper strip printer.
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The devcide is housed in a standard panzerholz case with a removable
lid at the front, common to the equipment cases that were used by the
German Wehrmacht 1 during WWII. It measures 34 x 22 x 23 cm and weight approx.
14.5 kg.
The T-lab-340 was intended for recording errors in the speed, measured in
Rotations Per Minute (RPM), of a teleprinter.
This was done by writing (printing)
the 5-level groups (bits)
to a paper strip by means of a helix spindle print head. The latter was
developed by Rudolf Hell and was also used at the heart of the famous
Hellschreiber.
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The internal speed of the device was carefully calibrated to match the speed
of a teleprinter. As the Hellschreiber - by design - prints an unsynchronised
image, the image will be sloped (i.e. running off the paper) when the speed
of the teleprinter does not match that of the T-lab-340.
The device shown here, has the identification 'T lab entw 340 a' - 1934
engraved on its model plate, which means that it is a prototype 1 developed
during World War II.
It is currently unknown whether the design ever passed the prototype stage
and, if so, how many devices were produced.
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Wehrmacht was the name of the German Army before and during WWII.
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'entw' is the abbreviation of the German word Entwicklung (Development).
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All controls and connections of the T-lab-340 are located at the front panel
of the device. When not in use, they are covered by a protective removable
lid. The device is powered from the 220V AC mains, for which a fixed cable is
present. The teleprinter line is connected at the bottom right.
The black unit at the left is the printer, which is similar to that
of a Feldhellschreiber. Paper is fed in from
the right, past the printhead and then between the capstan and a pinch
roller, leaving the device on the left.
Before printing, the arm with the ink roller should be lowered,
so that it comes in contact with the helix printhead.
A strong electromagnet, located in the rectangular black unit, pushes the paper
upwards against the printhead, in the rythm of the 5-level pulses.
This results in a series of dots (pixels) on the paper strip, representing
the 5-bit baudot characters in time.
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© Crypto Museum. Created: Friday 26 May 2017. Last changed: Monday, 23 September 2024 - 16:28 CET.
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