Magneto Wall Telephone
This set is specially designed for use on installations where there is any risk of the telephone
lines being brought into contact with lines carrying high-tension currents.
The case is of polished walnut, lined on the inside with tinned steel plates which are in connection with the earth terminal.
The micro-telephone is a dummy acoustically connected, by means of two special
rubber tubes 39 inches long, to the transmitter and receiver which are fitted inside the case.
The 5-magnet generator and 2000 ohm ringer renders this set very efficient on long lines and heavy bridging work.
Space is provided for two dry cells each having maximum dimensions of 7.5 x 3.5 x 1.75 inches.
A special protector is fitted internally, consisting of carbon arresters and heat coils.
All external parts liable to be touched are perfectly insulated from the internal working parts and circuit : the generator crank and switch arm being made of solid ebonite of massive proportions.
Dry cells are included.
N6505 protector fuse consists of two fuses N4600 mounted on a marble base and having a metal cover in contact with a terminal which should be connected to earth. The protector should be fitted near to the point where the telephone lines enter the building.
N8518 discharge coil is specially designed to reduce the disturbances from high-tension
conductors which may be in close
proximity to the telephone lines, and should be fitted at various points along the line.
|Code No.||Apparatus||Dimensions ins||Weight lb|
|N2950||Telephone||21.5 x 11.25 x 7.5||39|
Taken from the Ericsson catalogue, edition 26
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