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L. M. ERICSSON
TELEPHONES AC 130 & AC 140

TELEPHONE - TABLE
Magneto Telephone (AC 140 shown)

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AC 130 and AC 140
MICRO-TELEPHONE
RE 2002 (Old No. 520), resting on a cradle switch, with cord RS 7021 (Old No. 2252), flexible cable and terminal block with disc protector.

GENERATOR
2-magnet, which rings satisfactorily through a line resistance of 12,000-15,000 ohms. The magnets of the generator also form the legs of the telephone.

RINGER
Resistance of coils 1000 ohms.

The connections are so arranged that the bell in the telephone remains silent while the generator is being operated.

Overall dimensions: 12.0 x 7.9 x 5.5 inches.

Weight, 11.7 lbs.

TYPE AC 130 is fitted with a flexible cable RS 9600 (Old No. 2150), which is connected to terminals fitted under the ebonite base-plate. The generator is fitted with a "cut-out" with a flat spring, which is effected through the longitudinal movement of the spindle.

TYPE AC 140 is fitted with a flexible cable RS 9610, which is connected to the terminals fitted on the back edge of the ebonite base. The generator is fitted with a "cut-out" with a spiral spring, which is effected through the longitudinal movement of the spindle.

Taken from the Ericsson Telephone Catalogue 1912

Note
These telephones are similar to the AC120 but without the bell cut-out switch - this was now included in the sliding cut-out switch at the end of the generator shaft.  As the generator handle was turned, a spiral machining on its shaft operated the cut-out switch and broke the bell contacts.

The AC 140 has modified wiring which connects the transmitter and receiver in parallel, instead of in series.  This allowed the phone to still work in a limited fashion even if the transmitter or receiver failed.  In previous models the failure of one of these components meant the whole phone was inoperable.

 

 
 
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Last revised: December 14, 2024

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