Australian Public Telephone

units

The CT1apparently had a modification to prevent "free" calls.  This modification consisted of an oscillator activated after line reversal to generate an annoying tone on the line.  The idea being that it would discourage fraudulent use of the phone.  The CT1 was replaced in the mid 1970's by the CT3.

-special thanks to Henry Titchen.

COIN TELEPHONE NO.1 (ONE BUTTON MULTI-COIN OPERATION)(1967): The Coin Telephone No.1 known as CT1, was manufactured by Associated Automations in Britain and later in Japan and has similar facilities to the 2-Button Multi-Coin Telephone, but uses electronic­ally generated tones for identifying coin insertion to the operator. It has only one button which is for depositing the coins during operator-assisted calls and has an Australian modification which acts as a deterrent to calls without coins to service 11 numbers such as "Time", "Weather" and "Sport". This deterrent is an oscillator which when no coins are inserted, comes into circuit during line reversal to mask reception. To overcome the need for a second button to obtain coin refund, the circuit is arranged so that refund is obtained when the user replaces the handset.

VANDALISM MODIFICATION: The CT1 instrument underwent three major changes externally to cope with vandalism more effectively. Fig.28 illustrates the early version with front lock and pressed metal door. This was soon modified with a reinforced front

door lock and coin chamber housing (later side Chubb lock as with A.B. Multi-Coin Boxeo and reinforced diaphram of steel encasing the mechanism (Fig.29). The third type is the totally reinforced CT1 which had a heavy steel outer shell. At their peak it is estimated that 9000 including all types were in use in Australia. By mid 1970's they were being phased out in preference to the existing A.B. Multi-Coin Box and the new Coin Telephone No.3 and the CT1 were being installed only in safe locations on

private property.

Fig.28                                                                           Fig.29

Left Fig.32 Right Fig31

There was a CB version produced for country exchanges which had the dial blanked, calls being operator assisted. Tariff changes on all versions saw the originals change from five, ten and twenty cents, to ten and twenty cents.

Fig.32

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