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GERMAN  TELEPHON  W28 / SA28
SIEMENS & HALSKE  (1928)  » PROTOS «



GERMAN TELEPHONE   Model »SA28« / »PROTOS«   SIEMENS & HALSKE   (1928)
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Blind Print in Back Plate:                     V.Sa.tist.66cM    29199

This »SA28« is the "Office Version" of the "Standard Telephone" »W28«.
It consist of three parts: The TOP with dialer, the BASE with all the
electric elements & the BACK PLATE. All hold together with two screws.
The HANDSET is made of Bakelite; the microphone has a special cap.

W I R E   D I A G R A M :

   

Like the W28, the dial is blocked when the handset is in place. This
is a necessity, because pulses would go over the line when the dial
would be activated.

THE (West-)GERMAN "STANDARD TELEPHONES" OF THE » DEUTSCHE POST « ...
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    1928   »W28«    Metal
    1948   »W48«    Bakelite
    1961   »W611«   Thermoplast (ABS)



          ... Works well today too - especially when the power is off.

   Have a look at the NEWER W48, W611 w. Wire Diagrams ...
                     Historical Remarks ...
impressum: 
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann      09/09/15