|Automatic Table Telephone
The casework, micro-telephone and terminal block are of moulded, black Bakelite which is easy to keep clean and does not become shabby through long usage.
The mounting of the dial harmonises with the instrument. The dial is placed at such an angle that the figures are not obscured by the finger plate.
The micro-telephone is fitted with a detachable receiver and an "inset" transmitter.
The ringer, 1000 ohms, is fitted on the inside of the base which is cut away to permit of greater audibility, also a condenser 2pF, induction coil and switch are the other interior fitments.
All terminals are enclosed.
Dimensions 6.5 x 9.25 x 5.75 inches
Introduced in the early 1930's.
Circuit Diagram 28419 is dated 1931.
Taken from the Ericsson Catalogue No. 26 - 1935 Supplement
Similar sets can be found without an induction coil. These are wired to diagram N18835 and can be identified easily as the handset cord only has two wires connected.
The microphone and receiver are connected in series so the transmission would not be to the British Post Office standards.
This type of telephone is normally referred to as a 'cheapened set' and would most probably have been used on Private Automatic Exchanges.
The pictures below show a N1010B with no induction coil, as supplied to Telephone Rentals.
Introduced around 1934.
Last revised: June 22, 2020