SIEMENS BROTHERS Intercommunication Telephones

INTERCOMMUNICATION TELEPHONES

These telephones afford a simple means of providing a highly efficient and fully intercommunicating telephone system up to a maximum of twenty one stations.

They are available in wall or table patterns fitted with 5, 10 or 15 automatic restoring press button line selectors and a call buzzer. The table pattern is supplied complete with a flexible cord and terminal block.

The handset fitted is our high efficiency pattern with immersed electrode inset transmitter ensuring superior articulation with the highest transmission efficiency.

A system may consist of one more line than there are press-buttons on the telephones, e.g. telephones with ten buttons may be used to form an eleven-line system with each station having access to ten others.

The stations are interconnected by multicore cable and the whole system operates very efficiently over long periods from a single central battery; four cells are normally sufficient where the total length of cable does not exceed 250 yards. An A.C. all-mains unit can be provided in place of the battery, if preferred.

The picture shown to the right is the Model 115A/A.

The telephones have a plastic base plate and a steel cover.