Table telephone in latest British Post Office pattern black moulded Bakelite case, comprising hand
micro-telephone on automatic switch cradle, hand generator, 2000 ohm polarised bell, flexible cord and
The sliding directory holder is not
practicable on this telephone.
Height: 6.75 (172mm)
Width: 9.25 (235mm)
Depth: 7.25 (184mm)
Weight: 7.25 lbs (3.3kgs)
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 the SIEMENS BROTHERS & CO. LIMITED catalogue No.500/54