Wall telephone in polished hardwood case, with writing slope. Electrically similar to
No. 353D/A, with battery comportment
and two dry cells. Resistance of generator 500 ohm.
As No. 352C, but resistance of generator is 150 ohm.
Height: 15.75 (387mm)
Width: 13 (330mm)
Depth: 8.5 (216mm)
Weight: 9.75 lbs (4.5kgs)
Suitable for use in pairs on long lines and for connecting a number of instruments to one line, calling individual stations by code ringing. Also for use with magneto switchboards, etc.
In comparison with earlier types of magneto telephones they are small and tight, this being made possible by the use of a small but powerful generator embodying a magnet made of magnetic alloy, aluminium nickel-cobalt known as 'Alnico'.
These telephones can be modified for selective ringing by the addition of a icy; providing single-generator
earth ringing facility as well as normal generator ringing; as used by Electricity Supply Authorities, etc., for substation communications. Further particulars supplied on request.
From SIEMENS BROTHERS & CO. LIMITED catalogue No.500/54