Consisting of a K 7820 Telephone mounted on a Solid Polished Walnut
Backboard, with Battery Box containing three No. 3 C.E.C. Dry Dells.
Price in 1908 was £2.5.0
Battery Call Telephone
As K7820 but fitted on a back board.
Fitted with Hunningscone-Deckert transmitter.
This instrument is constructed of polished walnut and the finish of all external metal work is oxidised.
Cost in 1916 was £2.2.6
Later version had a carbon granule transmitter and the terminals were internal.
Wall pattern battery call telephone, comprising K 7670 carbon granule transmitter, K 7630 “Watch” pattern double-pole receiver, K 7728 induction coil, automatic switch hook, ringing key and 25 ohm bell on tail piece.
Weight, 3 lbs. 8 ozs.
Dimensions, l0 x 7 x 5 ins.
Last revised: February 05, 2011