Type OB 3500
Floor Pattern Switchboards
With Combined Jack and Indicator (Mechanically restored)
Metallic Circuit
Local Battery System
 OB 3500/25 shown pictured to the right.
FRAMEWORK
Woodwork, polished walnut, with the jack field covered with fibre. Legs enamelled cast iron.
EQUIPMENT
1 x COMBINED JACK AND 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 TEST JACK.
1 x TESTING KEY.
1 x CLEARING INDICATOR for each cord circuit.
NIGHT BELL.
NIGHT BELL SWITCH.
GENERATOR. RH 5000, 5-magnet.
MICROTELEPHONE. RE5052, with cord RS7021.
This type of switchboard is not usually kept in stock.
NOTE
The calling indicators are mechanically restored by the action of the plug.
|
TYPE |
No. of metallic ccts |
No. of cord ccts |
Height ins |
Width ins |
Depth ins |
Weight in lbs. |
|
OB 3500/25 |
25 |
5 |
57.30 |
16.92 |
31.8 |
88.20 |
|
OB 3500/50 |
50 |
10 |
58.07 |
22.05 |
31.8 |
132.30 |
|
OB 3500/105 |
105 |
15 |
61.81 |
26.18 |
31.89 |
198.45 |
(This type is only supplied for the extension of Old Exchanges. It is now superseded by type
OB 6020.)
Taken from the Ericsson Telephone Catalogue 1914
|
