BELL TELEPHONE MANUFACTURING Co.
(BTMC) ANTWERP
Telephone No. 2054

Wall-Mounted Safety Telephone Set
(with magnetic call and local battery)
for telephone lines located near power lines with a voltage of up to 500 volts
No. 22054

This wall-mounted safety telephone set is used when telephone lines are located near power lines with a voltage not exceeding 500 volts.

For higher voltages the wall-mounted telephone set No. 73236 is recommended.

To ensure that the person speaking on the telephone cannot come into contact with the transmission components, all conductive metal parts, the connecting terminals, and the transmitter are located inside the set or are specially insulated.

The transmitter's electrostatic socket is screwed into the opening in the woodwork opposite the transmitter's diaphragm.

The receiver cord is covered with a rubber sheath.

The protection system must be completed by a No. 74 protector, enclosed in a metal housing, comprising two 12-amp fuse breakers. This protector has copper blocks with double circuits and a transducer, used to electrically separate the telephone lines.
The telephone lines are connected to the transducer. The external lines are connected to the protector's terminals.

This protector is placed at the junction point of the internal lines with the telephone lines.


22054A
A wall mounted Telephone Set for Parallel Connection, constructed of Walnut Woodwork with nickel-plated metal parts, comprising a Telephone No. 2054A.

Includes a 4-pole magneto generator No. 2047A, switch hook No. 2035A, polarised ringer No. 2022C (1000 ohm resistance), induction coil No. 2201C, Solid Back transmitter No. 2630D, bipolar receiver No. 2667B with a two-conductor cord No. 5025 insulated with canutehone, backboard No. 2015A for 2 large Leclanché units or 3 cylindrical dry cell batteries (Blue Bell).

Dimensions: 730 x 276 x 190mm.



22054B
Similar to the No. 22054A but for Series Connection.  Comprising of a Telephone No. 2054B, with polarised ringer No. 2022C (120ohm resistance) and induction coil No. 2202B.

Taken from the 1910 BTMC Catalogue