The casework of this instrument is of polished hardwood and incorporates a handy writing desk and a battery compartment measuring 7.25 x 6.5 x 3.25 inches which will accommodate 2 dry or inert cells.
The equipment comprises a compact "alnico" magnet generator, ringer, anti-side-tone induction coil, Bakelite micro-telephone and enclosed terminals.
The wiring is arranged so that a condenser may be readily added in the ringer or receiver circuit as desired.
Telephone N2515 is shown pictured to the right.
Micro-telephone Cord N4021
This instrument has the same appearance as that illustrated above, but is designed and equipped for mine work, and has been approved by the Mines Department as intrinsically safe, and may, therefore, be connected with the underground circuits.
In common with other certified apparatus its connection and use is governed by the Telephone and Signalling Order S.R. & 0. 1938-1407.
It is intended solely for use on the surface and under cover, as in offices, etc., where an ironclad telephone is out of place. It is not suitable for use below ground or in exposed positions.
Mines Department Type - Model N2518 and N2519.
Last revised: December 29, 2019
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