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SWITCH BOARDS WITH INDICATOR JACKS
We have already drawn attention to our patented indicator jack in the main body of our
Catalogue. It is a combination of an indicator and a jack, such, that the action of
inserting the plug to answer restores the indicator; the restoring, however, is
mechanically,
not electrically, accomplished. The indicator part of the combination consists of a
cylindrical tube of metal arranged concentrically round the bush or barrel of the jack and painted
white
on the outside. Normally this tube is visible merely as a white ring round the bush, but
when a call is made, it springs forward about half an inch and immediately attracts the
operator's attention. To answer, the plug is inserted as usual, and, being provided with a
broad shoulder, pushes the indicator back into its normal position.
A lot of work is
spared
the operators by this arrangement, and, if in addition the ringing-off indicators (as is
the
case in, all of the boards illustrated below) are automatically restored, the operating of
these
boards is very quick and simple.
The indicator jacks do not occupy any more space than a jack and lamp together, no relays are necessary with
them, and they may be used for both magneto and battery
calling.
We now manufacture the following standard pattern switchboards with indicator jacks.
 No. 978.
This is similar to No. 664.
The ringing-off indicators are automatically restored when the plugs fall back into their
sockets. The six keys for ringing or speaking on one cord only which are embodied in our
No. 664 pattern are here replaced by three smaller keys. The usual parts are included,
i.e., hand generator, hand micro-telephone No. 490 with cord No. 2052, night bell, &c.
| Catalogue Number
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975
|
976
|
977
|
978
|
| Number of lines
|
25
|
30
|
40
|
50
|
| Pairs of Cords and Plugs
|
5
|
6
|
8
|
10
|
| Height in Inches
|
52
|
52
|
52
|
52
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| Width in Inches
|
20
|
20
|
20
|
20
|
| Weight in Lbs
|
138.5
|
142.5
|
149
|
157
|
| PRICE
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£41 5 0
|
£46 17 6
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£54 7 6
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£66 15 0
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 No. 980
This board is similar to No. 978, but of larger dimensions. No. 979 is built for
100
lines, No. 980 is fitted for 100 lines, but has capacity for 200 lines. No. 981 is fully
equipped
for 200 lines. The usual accessories are included.
| Catalogue Number
|
979
|
980
|
981
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| Number of lines
|
100
|
100
|
200
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| Pairs of Cords and Plugs
|
10
|
10
|
15
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| Height in Inches
|
53
|
56
|
56
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| Width in Inches
|
23
|
23
|
23
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| Weight in lbs
|
213
|
219
|
260
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| PRICE
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£100
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£102
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£150
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 No. 983.
This board is similar to our No. 651 enclosed pattern. Here also the clearing
indicators are automatically restored by the plugs returning to their sockets. Three service keys are
fitted, instead of the six usually included, and a hand set No. 494 with cord No. 2052.
Much space is saved by substituting the indicator jacks for indicators and jacks, and as a
result a larger multiple capacity is obtained than in the older pattern.
|
Catalogue Number
|
982
|
983
|
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Number of lines
|
50
|
100
|
|
Pairs of Cords and plugs
|
10
|
15
|
|
Height in Inches
|
59
|
60.25
|
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Width in Inches
|
17.75
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23.6
|
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Weight in Lbs.
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157
|
238
|
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PRICE
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£75
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£104
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Taken from the Ericsson Telephone Catalogue 1903
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