Type OB 3010/150
Two-Position Floor Pattern Switchboard
Mechanically restored Jack Indicators
Local Battery System
150 metallic circuit lines.
Woodwork, polished mahogany, with the jack field covered with fibre.
Legs, enamelled cast iron.
24 PRESS BUTTONS for restoring the clearing indicator when both plugs are in use.
2 PILOT VISUAL INDICATORS for calling.
1 NIGHT BELL.
2 PILOT VISUAL INDICATORS for clearing.
3 NIGHT BELL SWITCHES.
150 JACK INDICATORS.
2 RINGING VIBRATORS for supervising the outgoing ringing current.
24 PAIRS OF CORDS with 2 point plugs.
24 SPEAKING AND RINGING KEYS.
2 KEYS for connecting all cord circuits to one of the operators positions.
2 DOUBLE SPEAKING KEYS.
2 DOUBLE RINGING KEYS for Hand generator.
2 GENERATORS. RH 5000, 5-magnet.
2 MICROTELEPHONES. RE 4052, with cord.
2 DOUBLE BATTERY RINGING KEYS.
2 POWER GENERATOR RINGING KEYS.
1 TESTING KEY.
2 PRESS BUTTONS for short circuiting the secondary winding of the induction coil.
2 PRESS BUTTONS for closing the, transmitter circuit.
24 CLEARING INDICATORS.
Approximate Weight, 253.57 lbs.
The jack indicators are mechanically restored by the action of the plug whilst the clearing and pilot visual indicators are self-restoring.
Taken from the Ericsson Telephone Catalogue 1914
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