TELEPHONE No. 10
CB Candlestick with press button fitted to base.
Introduced circa 1907 and still in the GPO stores catalogue in 1928. The picture to the right shows an earlier variant, later variants looked like the standard British candlestick (see picture below).
The press button was used to call a buzzer on another phone to advise there was a call for them.
Circuit diagram - N110.
Last revised: December 02, 2018