TELEPHONE MANUFACTURING Co. (TMC)
TELEPHONE s542558

Table telephone which is a GPO Telephone No. 746, converted to a Local Battery telephone with two additional switches and a gravity hook operated switch fitted.

It has an integral transistorised ringing generator, a local battery coil and an additional gravity switch operated springset.

The mesh under the bell gongs is to stop insects and foreign objects entering the telephone. The case also has a foam strip, were the base meets the casing, to stop dust entering the telephone.

Used by the Irish P&T as their Model 100M Mark 560 on Magneto circuits.

Requires a 4.5v or 6v power supply / batteries to power the transmitter and operate the ringing generator.

Ringing is only possible with the phone on hook. A single press button operates both the two installed switches (KR1 and KR2) at the same time.

Click here for a diagram (dated 1978).