
The Design of German
Telephone
Subscribers'Apparatus
BIOS Report No. 606
Reported by
BIOS Trip No.
1533
BIOS Target
Nos:
7/57, C7/57i,
C7/211, 7/131, C7/277, C7/280, C7/276, 7/26
Keywords:
German standards for exchange service; Maintenance; Telephone Installation Work;
Super - posed Wire Broiadcasting (Drahtfunk); General Meachanical features;
Trends in electrical and acoustical design; The Anti-Side Tone Circuit (Übersprechen
oder Nebensprechen?); Local battery microphones; Transverse current microphones;
Regenerative microphone under development by RPF (= Reichspostfurschunsanstalt);
Recent developments by Siemens & Halske (S&H); Receiver under development by
RPF); Sound powered telephones by Siemens; Operators'Telephone head set with
microphone; Telephones for deaf; Telephones for long lines;
Subscribers'amplifiers; Auxiliary receiver; Loud speaking telephones; Zweiband
system of "4-wire wirking" on single-pair lines; Telephone instrument tester;
calibration of receivers; Sound absorbent room; Recording wave analiser;
Impedance measuring set; Calibration of condensor microphones; Condenser
microphone for explosion measurements; Gramophone recording; Former German Dial;
Operator dials; Other impulsing devices; Private-Automatic Branch Exchanges;
Multi-Fee working; Relative specifications and police-Orders; Type test of
flameproof apparatus; Reports on visits to manufacturers' works; Frequency
inversion system for telephone circuits; Band splitting system; Time Scrambling
system; Wobble-Frequency system; Reichspost policy for subscribers'apparatus ...
; German telephone instruments differ from their B.P.O. equivalents in the
greater use of metal pressing ... ; Formerly the Reichspost examined a small
portion of a contract by articulation testing. If these were below standard the
whole delivery was returned to the contractor .. ; Mr. Panzerbeiter of Siemens &
Halske .. ; Janovsky - Hölzer; The early Siemens & Halske sound telephone was an
imitation of Western Electric Co's. instrument and was coded No. 33b ... ;
Hagenuk of Kiel were stated to have developed a mechanical amplifier using a
crystal receiver copled to a carbon microphone ... ; The Lorenz Zweiband system
was contrived so that ... ; "hard ear" ... ; Recording analyser was seen at PTR.
This was a development of the design described by Jacobi in W.V.S.K. ..
during the war it had been used to analyse records of scrambled
telephone speech ... : Synthetic shellac "Troschell" made by I.G.
Farbenindustrie .. ; The circuit of the 50- and 100-line lamp-signalling P.M.B.X.
switchboards are generally similar to those of the B.P.O. .. ; Large power are
now mostly replaced by electromagnetic circuit breakers, whereas individual
apparatus circuits are protected by heat coils; Telephone and Radio-telephone
privacy equipment ... ; Six or ten pairs of 2-band equipment were supplied by
Siemens & Halske to the German Navy for installation in Cruisers. A few pairs of
3-band equipments were provided for radio communication between Berlin and the
german Embassies in London and other foreign capitals. A 5-band system with
automatic switching was employed the reichspost for transatlantic radio circuits
to the U.S. telephone system; Band slitting equipment was regarded by Sacklowski
as somwhat better ... ; Wobble-Frequency system was developed for the Luftwaffe
on decimetre-wave beam sircuits. ... ; Ohnesorge Reichspost Minister ... ;
Atlas-Werke Dr. Blaum works manager of mechanical department - Herr Sommer works
manager of electrical department - Dr. Maass physicist and laboratory manager -
day of visit 17 th December 1945 ... The main factory is at Bremen, others were
at Gnadenfrei (Silesia), Munich and Elmshorn ... ; Ecjo sounders for trawlers ..
; Mass was very proud of a discovery which he claimed was entirely new.
.... ; Speech audiometer of their own design .. ; manufacture of Rochelle salt
crystals at Atlas-Werke Elmshorn (target C7/276) ...
Please return
to, or proceed with: FIAT-CIOS-BIOS index pages
Please go back
to, or proceed with: Handbooks papers and product
information
