NATIONAL TELEPHONE COMPANY
B31

Magneto Wall Sets

Pattern No. B31

Comprises - Granular Carbon Transmitter with projecting mouthpiece, Double Pole Receiver, Cord, Automatic Switch-Hook, Induction Coil, Lightning Arrester, 2 Magnet Generator and Bell.

This set is suitable for any distance up to one mile.  The batteries are fitted away from the instrument.

Taken from the 1903 Catalogue.