For manual LB Systems
Magneto wall telephone with Laryngotelephone
When the handle of the generator is turned the bell is cut out. The receivers are provided with leather pads.
Instruments with laryngotelephones are designed for use in places such as in engine rooms, power stations, etc. where disturbing noise makes it impossible to carry on conversation by means of ordinary
Laryngotelephone has a special microphone which is held against the larynx during conversations. The
speech oscillations are transferred direct to the diaphragm of the micro phone without disturbance from external noise. The speech as reproduced is perfectly clear and distinct. Two dry cells RK 210 are required. A
suitable battery case is RK 2300.
Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 188 (1934)
Last revised: September 29, 2019