Portable Automatic Telephone
This instrument is specially designed for telephone linesmenís use, or may be used as a temporary station which can readily be moved from one place to another.
For automatic exchange use it is fitted with a standard dial, but so that it may also be useful on magneto and central battery manual systems, it is equipped with a 3-magnet generator, 500 ohm ringer, induction coil, condenser and small battery.
The apparatus is contained in a polished hardwood case having a compartment to take the telescopic micro-telephone and waterproof cord. The dial and line terminals are mounted on the top and the whole is protected by the leather carrying case which is provided with a shoulder strap.
Dry Battery N3757 standard and N3759 tropical.
NOTE - A similar instrument without dial for magneto or central battery manual systems is available - N1830.
Overall dimensions 9 x 8.75 x 4.3 inches
Weight 9lb 14oz
N1831 was supplied to the GPO as their Telephone No. 44B and was fitted with a dial.
Introduced in 1934.
Taken from the Ericsson catalogue
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