INTERCOMMUNICATION TELEPHONES WITHOUT INDUCTION COIL ELECTRO-MAGNETIC AUTO-RESET TYPE
These instruments are equipped with a combined line selector and ringing key in the a push button, which, when pressed, rings and selects the number required in ration. The buttons are held down during an outward conversation by an auto-vice, which restores the key to the normal position immediately the handset has been replaced on the cradle after a conversation has ceased. Before an outward call is made, it is necessary to remove the handset from the cradle. The button of any one line only be pressed when making an outward call; all incoming calls are answered y removing the handset from the cradle. Designation strips are fitted at the side row of buttons.
working parts are mounted on a strong steel frame with machine screws and fixed on a wood base, with a black stove-enamelled pressed steel cover overall. All instruments e to the same dimensions, irrespective of the number of lines, and are so arranged all capacity instruments can be extended on site by units of 5 lines, up to their capacity of 21 lines. Spare parts are obtainable for making extensions.
These instruments are suitable for working in conjunction with the Sterling “Primax”.
Wall type telephone, comprising automatic cradle switch, 25 ohm buzzer, impedance coil, and latest pattern black Bakelite handset without battery key in handle, fitted with a superior quality electro-magnetic receiver and improved type inset transmitter, which can be easily removed.
Dimensions, 10 x 9 x 7 ins.
Last revised: January 27, 2011