HD 300
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.

Parts:
Microtelephone RE 1048 of black Bakelite with removable capsule transmitter RC 4000/40, 40ohms, and rubber insulated cord RS 5120.
Laryngotelephone RE 9600 of black Bakelite with rubber insulated cord RS 5121.
Extra receiver RD 210 of black Bakelite with rubber insulated cord RS 4900.
Six way switch for selecting the lines.
Signal key for calling.
Case of black enamelled light metal.

Dimensions:
Height 235mm, width 190mm.  The dimensions refer to the back plate of the telephone.

Weight 4.6 kg.

Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 188 (1934)

Last revised: March 23, 2024