TELEPHONE No. HD 300
Ships’ telephone for 5 lines
All receivers are of loudspeaking type and provided with leather pads to shut out external noise. The telephone is designed for mounting in the engine room or other places where noise makes it impossible to carry on conversation by means of ordinary micro-telephones. A DC bell RA 1200/12 is required for the telephone. The Laryngotelephone is provided with a special microphone which is held against the larynx during conversations. The speech oscillations are transferred direct to the diaphragm without disturbance from external noise, see illustration on page 18.
Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 188 (1934)
Last revised: October 11, 2019