Type OB 3000 - 3001
Floor Pattern Switchboards
Mechanically restored Jack Indicators
Metallic Circuit
Local Battery System
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.
The OB 3000/25 shown
pictured to the right.
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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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