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ERICSSON
SWITCHBOARD No's OB 3000 & OB 3001
 


Type OB 3000-3001
Floor Pattern Switchboards
Mechanically restored Jack Indicators
Metallic Circuit
Local Battery System

OB 3000/25 shown pictured to the right.

FRAMEWORK

Woodwork, polished mahogany, with the jack field covered with fibre. legs enamelled cast-iron.

EQUIPMENT
1 x JACK INDICATOR for each line.
1 x PAIR OF CORDS with 2-point plugs (see table for number of cord circuits on each board).
1 x SPEAKING AND RINGING KEY for each cord circuit.
1 x DOUBLE SPEAKING KEY.
1 x DOUBLE RINGING KEY for Hand Generator.
1 x DOUBLE BATTERY RINGING KEY.
1 x POWER GENERATOR RINGING KEY.
1 x TESTING, KEY.
1 x PRESS BUTTON for short circuiting the secondary winding of the induction coil.
1 x PRESS BUTTON for closing the transmitter circuit.
1 x CLEARING INDICATOR for each cord circuit.
1 x PRESS BUTTON for each cord circuit, for restoring the clearing indicator when both plugs are, in use.
NIGHT, BELL.
PILOT VISUAL INDICATOR for calling.
PILOT VISUAL INDICATOR for clearing.
2 x NIGHT BELL SWITCHES.
RINGING VIBRATOR for supervising the outgoing ringing current.
GENERATOR. RH 5000, 5-magnet.
 

TYPE OLD TYPE No. No. of metallic ccts No. of cord ccts Height ins Width ins Depth ins Weight in lbs.
OB 3000/25 975 5 5 51.57 19.52 24.64 137.81
OB 3000/30 976 30 6 51.57 19.52 24.64 140.00
OB 3000/40 977 40 8 51.57 19.52 24.64 146.63
OB 3000/50 978 50 10 51.57 19.52 24.64 154.35
OB 3000/100 979 100 10 56.30 23.23 23.23 209.47
OB 3000/200 981 200 15 56.30 23.23 23.23 255.80
OB 3001/100 980 100 15 56.30 23.23 23.23 216.09



Types OB3000/100 and OB3001/100 are both equipped for 100 lines, but in OB3001/100 provision is made for equipping a further 100 lines, making it into a 200-line board.
NOTE. The jack indicators are mechanically restored by the action of the plug and the clearing and pilot visual indicators, are self-restoring.

 


Taken from the Ericsson Telephone Catalogue 1914

 
 
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Last revised: October 08, 2019

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