TELEPHONE No. 250
The Telephone No. 250, shown to the right, is a portable linesman's telephone of the local battery variety. It has an integral battery, ringing generator and a dial. The telephone can be used on auto lines.
The Telephone No. 250A had a socket that accepted a headset.
The generator handle is stowed by means of the brass clip inside the lid and
the mouthpiece was flattened.
Circuit diagram N350.
The battery used in the phone is a Battery Dry No. 11. The voltage is 3 volts. This is effectively two dry cells in a cardboard container.
The battery container size is 74mm high x 65mm wide by 33mm deep.
Last revised: May 02, 2010