Types M.A. 20 & 30
Combined Telephone and Telegraph Instruments
APPARATUS CASE of fibre. Dimensions 5.95 x 4.14 x 1.90 inches. Containing a buzzer, line condenser, and dry cell R.K. 170 (Old Catalogue No.
MICRO-TELEPHONE. RE. 9100 (Old Catalogue No. 496), telescopic type, with waterproof cord R.S. 7010 (Old Catalogue No. 2159). The cord is provided with a plug which fits into a jack in the apparatus case through an aperture in the side of the leather case.
EXTRA RECEIVER. R.F. 1200 is provided with head straps and fitted with waterproof cord and plugs R.S. 4560 (Old Catalogue No. 2363).
LEATHER CASE. This is constructed to hold the Apparatus Case, Micro-telephone, and Extra Receiver. Type M.V. 20 is fitted with loops so that it may be carried on the waist belt, and type M.V. 30 with shoulder straps.
This instrument is intended for telephonic as well as telegraphic communication, the latter by means of the buzzer.
|MA 20||MV 20||4.8|
|MA 30||MV 30||5.1|
When it is required to ring a magneto bell or indicator at a distant end, our Portable Generator type M.A. 300 can be used in conjunction with these instruments.
We formerly supplied the above instrument with the extra receiver directly connected to the Micro-telephone plug.
Taken from the Ericsson Telephone Catalogue 1911
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