MAGNETO CALL TELEPHONE
Specially Constructed for Tropical Climates
AS SUPPLIED TO THE COLONIAL GOVERNMENTS
Bridging Type Wall Telephone
Comprising a Four-magnet Generator with Laminated Swedish Iron Armature, wound to a resistance of 500 ohms, the Gearing fitted with a Spring-cushioned Pinion to facilitate quiet running, Armature and Pole Plates are heavily Copper-plated to prevent rusting.
Polarized Bell with Coils wound to 1,000 ohms resistance, with 2.5 inch Nickel-plated Gongs, and adjusted to ring through a line resistance of 30,000 ohms.
Long Automatic Switch Hook with Gold-Silver Alloy Contacts, Lightning Arrester of plate type with perforated Mica Separators between the Plates.
Induction Coil, wound to a resistance of 1 ohm primary and 25 ohms secondary, thoroughly
Shellac varnished to prevent the entrance of moisture.
Woodwork of solid well-seasoned Teak, Polished, the sides being reinforced by Nickel. plated Brass Angle Plates.
The Hand Microtelephone is fitted with 'Manchester' Shot Carbon Transmitter,
constructed entirely of non-absorbent material and specially suitable for use in a damp climate. It is provided with a Four-conductor Green Cord and Four-pin Plug fitting into a Four-way Jack let into the side of the Case.
The Receiver is of the Double-pole 'Ring' type as used on all our best quality Hand Combinations.
All external metal parts Nickel plated and Lacquered.
Price in 1908 was £4.5.0
Taken from the GEC Telephone Catalogue, K Section, 10th Edition, 1908