L. M.
ERICSSON | ||||||
TELEPHONE - WALL TERMINAL-STATION TELEPHONE FOR TRUNK LINE WORK
No. 320 A key for short-circuiting the bell, when a signal is given, and the induction coil, when listening, is fitted. This prevents noise in the neighbourhood of the instrument from being heard, and also reduces the resistance, which will be found an advantage oil long lines. The key is to be pressed down when listening only, and not when talking. Some practice will be required in order to get the full advantage of this arrangement, but it is, of course, by no means necessary to use it under ordinary circumstances. The instrument is fitted with a Paper clip instead of the writing table shown on the figure. Weight 20.5 lbs. Price £4 1 0s. Renumbered as the AB 500. |
||||||
Last revised: March 28, 2024FM2 |