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The telephone, who really invented it?

The telephone, who really invented it?


Image of GERMAN TELEPHONE EXCHANGE SIEMENS

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GERMAN TELEPHONE EXCHANGE SIEMENS

Believed to have been made by Siemens in Germany during WW2 but there is no military markings on the unit. Switching is achieved by loose cords and plugs, with flaps on the front to indicate that a phone has been lifted, buttons on the front can select one circuit at a time presumably for the operators headset. Dated 1940

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A1446

Image of ADVANCE PRIVATE AUTOMATIC  EXCHANGE (SWITCHBOARD)  MASTER STATION, 1970's

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ADVANCE PRIVATE AUTOMATIC EXCHANGE (SWITCHBOARD) MASTER STATION, 1970's

Transistorised unit with speech amplifier for office communications.
The dial mounted on the front is for internal dialling.

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A0047

Image of PO WALL CLOCK, 1970's

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PO WALL CLOCK, 1970's

Slave units used in Telephone Exchanges and also in Post Offices for many years, these were driven by a master long case clock situated in the Exchange.

See Item A0073

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A0351

Image of GPO EXCHANGE OR MASTERCLOCK, 1960's

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GPO EXCHANGE OR MASTERCLOCK, 1960's

Pendulum clock used in telephone exchanges, for timing functions.
Item A0357 is the relay unit for this.
Using the Hipp toggle principal which swings the pendulum by pulling it every so often by a magnet powered by electric pulses, supplied only when the momentum of the swing started to die.
This unit uses a modified version of this system.
Matthaeus Hipp in 1838 is reported to have invented the toggle in a dream, at a very early age. He got up and drew it immediately. This is almost certainly fiction.
See http://www.electric-clocks.nl/clocks/en/page04.htm for the history

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A0073

Image of EXCHANGE CLOCK CONTROL UNIT, 1940's

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EXCHANGE CLOCK CONTROL UNIT, 1940's

Used to control equipment connected to the exchange master clock
Item A0073.

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A0357

Image of GPO ENGINEERS BUTT, 1960's

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GPO ENGINEERS BUTT, 1960's

Used by engineers in telephone exchanges, and on the road for testing telephone lines.

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A0043

Image of PAY PHONE DISK TEST COINS, 1970's

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PAY PHONE DISK TEST COINS, 1970's

Used for checking operation of telephone coin boxes.
Sizes are early Metric type.

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A0060

Image of GPO ENGINEERS CLEANER BLOWER, 1950's

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GPO ENGINEERS CLEANER BLOWER, 1950's

Used by cleaners and engineers to blow the dust from telephone equipment.

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A0064

Image of GPO  TELEPHONE OPERATORS HEAD SET, 1950's

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GPO TELEPHONE OPERATORS HEAD SET, 1950's

Headset used by manual switchboard operators.

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A0062

Image of GPO CHEST MICROPHONE, 1940's

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GPO CHEST MICROPHONE, 1940's

Transmitter Breast Sound Powered No2-Mk3
Used by Telephone Switchboard Operators.

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A0908

Image of 25 x 4 UNISELECTOR No 15A, 1950's

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25 x 4 UNISELECTOR No 15A, 1950's

Uniselector for use in Private Automatic Exchanges (PAX).
Origin Unknown.

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A0562

Image of STROWGER MULTI-SELECTOR (UNIDENTIFIED), 1950's

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STROWGER MULTI-SELECTOR (UNIDENTIFIED), 1950's

Multi selector for use in large Private Automatic Exchanges (PAX)

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A0564

Image of STROWGER FINAL SELECTOR, 1970's

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STROWGER FINAL SELECTOR, 1970's

Type 2000 Strowger Final Selector for automatically connecting up to 100 telephone circuits to one.
If more units are linked together complete telephone numbers can be selected.

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A0559

Image of PO PRE 2000 SELECTOR, 1950's

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PO PRE 2000 SELECTOR, 1950's

Exchange Strowger Selector. Used before the new 2000 series, which looks similar.
For automatically connecting up to 100 telephone circuits to one.
If more units are linked together complete telephone numbers can be selected.

The unit is shown on its side, for the correct orientation see Item A0559

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A0951

Image of STROWGER SELECTOR, 1970's

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STROWGER SELECTOR, 1970's

Strowger type multi selector in use up until the late 70's.
Up to 100 telephone lines can be selected with this unit.

The unit is shown on its side, for the correct orientation see Item A0559

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A0741

Image of GPO DYNAMOTOR No 50A, 1970's

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GPO DYNAMOTOR No 50A, 1970's

Dynamotor for generating all the tones necessary in a telephone exchange including the voltage for the ring signal.
also the tones including, Park, Busy and Number unobtainable.

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A0558

Image of SIEMENS EXCHANGE RING GENERATOR, 1950's

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SIEMENS EXCHANGE RING GENERATOR, 1950's

Used in small telephone systems for creating enough voltage to drive telephone bells.

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A0083

Image of ERICSSON PMX 5 x 40 SWITCHBOARD, 1940's

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ERICSSON PMX 5 x 40 SWITCHBOARD, 1940's

Made by L.M.Ericsson and imported.
Early style manual Switchboard.

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A0059

Image of 3 x 1 SMALL DOLLS EYE EXCHANGE (SWITCHBOARD), 1940's

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3 x 1 SMALL DOLLS EYE EXCHANGE (SWITCHBOARD), 1940's

Small manual telephone exchange for one exchange line and three extensions.

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A0528

Image of GPO 5 x 20  DOLLS EYE EXCHANGE (SWITCHBOARD), 1950's

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GPO 5 x 20 DOLLS EYE EXCHANGE (SWITCHBOARD), 1950's

Standard GPO design of manual type 'Dolls Eye' Switchboard.

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A0058

Image of GPO 2 x 4 DOLLS EYE SWITCHBOARD, 1950's

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GPO 2 x 4 DOLLS EYE SWITCHBOARD, 1950's

Manual switchboard used in offices between the Wars and after.
Diagram for this unit is N935. (Called 'N' diagrams by the GPO) Possibly dated May 1959

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A0046

Image of RELIANCE PAX, 1940's

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RELIANCE PAX, 1940's

Donated by The Forest of Dean Railway Company where it was in use. Restored and repaired and now in fully working order. PAX stands for Private Automatic Exchange. Some parts are dated 1946.

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A0050

Image of GPO MACADIE KEY SENDER, 1950's

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GPO MACADIE KEY SENDER, 1950's

These units were designed to help Telephone Operators with the fatigue caused by continuous dialling.Invented by Donald Macadie. Patent June 14, 1932

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A0021

Image of GPO TIMER 70A, 1950's

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GPO TIMER 70A, 1950's

Timer unit driven by exchange clock and used for timing functions in the exchange.

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A0079

Image of GPO TIMER 62A, 1970's

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GPO TIMER 62A, 1970's

Used for timing functions in exchanges and driven by the exchange clock.

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A0080


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