Type OB 300
Wall Pattern Switchboards
Earth Circuit
Local Battery System OB 300/12 shown
pictured to the right.
THE CONNECTIONS ARE MADE BY MEANS OF PLUGS AND CORDS.
FRAMEWORK
Polished walnut. The jack field is covered with fibre.
EQUIPMENT
1 x JACK per line.
1 x CALLING INDICATOR per line.
1 x PAIR OF PLUGS AND CORDS (see table for number of cord circuits for each board).
1 x CLEARING INDICATOR for each cord circuit.
1 x OPERATOR'S PLUG AND CORD.
1 x SPEAKING AND RINGING KEY for each cord circuit.
NIGHT BELL.
NIGHT BELL SWITCH.
MICROTELEPHONE. RE 5052 with cord RS 7021.
LIGHTNING PROTECTOR, with arrangement for connecting all lines to earth.
GENERATOR. RH 4160, 4-magnet.
|
TYPE |
OLD TYPE No. |
No. of Earth ccts |
No. of cord ccts |
Height ins |
Width ins |
Depth ins |
Weight in lbs. |
|
OB 300/6 |
621 |
6 |
2 |
30.50 |
10.23 |
9.64 |
28.00 |
|
OB 300/9 |
622 |
9 |
3 |
33.86 |
10.23 |
9.64 |
33.00 |
|
OB 300/12 |
623 |
12 |
4 |
33.86 |
10.23 |
9.64 |
35.28 |
|
OB 300/16 |
624 |
16 |
4 |
36.69 |
10.23 |
9.64 |
38.58 |
|
OB 300/20 |
625 |
20 |
5 |
37.20 |
12.00 |
9.64 |
45.64 |
|
OB 300/25 |
626 |
25 |
5 |
40.56 |
12.00 |
9.64 |
48.51 |
|
OB 300/30 |
- |
30 |
6 |
40.56 |
12.00 |
9.64 |
52.92 |
Taken from the Ericsson Telephone Catalogue 1914
|
