TELEPHONE No. 222
Wooden cased telephone used a a demonstration telephone. Normally used in pairs and sometimes called a "school set".
Each set had it's own serial number and instructions for use on the front flap.
The wiring is heavy gauge single core and covered in a 1930ís plastic type material. All components are identified by engraved labels.
A dial is fitted and for demonstration purposes, when used, flashes the small lamp, which is situated to the right of the dial.
The units are powered by two batteries (not shown) and connected together by 4 wires. A wiring diagram would normally be provided on the inside of the cover.
The picture to the right shows a set that has the trumpet missing from the transmitter.
Renamed as the Demonstration Set No. 1.
Circuit diagram - N322.
Last revised: November 20, 2021