Peel Conner Central Battery Switchboards
Information taken from the Peel Conner Bulletin No. 5 (1915)

In compiling this Bulletin we have endeavoured to give a clear and concise description of our Central Battery Non-Multiple Switchboards. A full understanding of the work in hand, together with a careful consideration of small details and an earnest desire to have every part perfect, has enabled us to produce a line of apparatus which has three noticeable characteristics:- Efficiency, simplicity, and durability.

Our Switchboards are made in two classes, viz., Standard and Tropical, the first being for use in normal climates, while the second is specially designed to withstand the severe conditions imposed by tropical climates.

In the design of the tropical class every care has been taken to eliminate all materials likely to become affected by climatic conditions and insects. All coils are wound with specially insulated magnet wire, cords are impregnated to render them impervious to moisture, and metal parts throughout are heavily coated to prevent rusting.

The woodwork for all Tropical Switchboards is specially selected teak and for Standard the best American Black Walnut is used. with the exception of the No. 1400 Style (cordless), when Mahogany is used.

We desire to call special attention to the fact that with the description of each style of switchboards a list of various standard equipments is given. These equipments have been prepared from what our experience has shown to be most in demand; any switchboard, however, can be fitted with equipments to suit special circumstances, including Jack or Plug-ended Junction Circuits to or from Central Battery or Magneto Exchanges.

Suitable telephones to be used in conjunction with these Switchboards will be found in Bulletin No. 2.

No. 1, Magneto Call Telephones.
No. 2, Central Battery Telephones.
No. 3, Central Battery Multiple Switchboards.
No. 4, Magneto Call Switchboards.
No. 6 Switchboard Protective Devices

No. 1000, 1100 and 1200 Style
Central Battery Visual Signal Floor Pattern Switchboards

The efficient working of Visual Signal Switchboards depends almost entirely upon the reliability of the signals with which they are equipped; and we have, therefore, in the design of our LINE VISUAL SIGNAL AND SUPERVISORY VISUAL SIGNAL, aimed to avoid the faults common to the majority of visual signals at present on the market, and produce something simple, durable, and thoroughly efficient. This we claim to have successfully accomplished, which enables us to offer an equipment, in which defects generally found in visual signal boards have been eliminated.

A very common source of trouble with the usual types of visual signals is dust and dirt on the pivots, causing them to stick and prevent successful operation. This trouble we have entirely overcome, firstly by the special design of the signal itself, secondly, by wholly enclosing it within the switchboard, the front of the latter being fitted with glass to enable the operation to be seen.

This glass front not only protects the signals from dirt and dust, but also protects them from damage, accidental or otherwise, by the operators.

A serious defect of visual signal switchboards in the past, has been the employment of supervisory, signals in the cord circuits, giving negative supervision; frequently these signals have been mounted in the face of the switchboard. Peel-Conner Switchboards have supervisory signals giving "DOUBLE POSITIVE SUPERVISION," these being mounted with the associated cords and plugs in the keyboard.

By "POSITIVE SUPERVISION" we mean that the clearing signal does not show during a conversation, but appears at the conclusion when the parties hang up their receivers; 'DOUBLE POSITIVE SUPERVISION" means that independent positive supervision is obtained over the calling and called subscriber, as is the case on large modern multiple exchanges where the utmost speed and accuracy in operating are essential.

The Switchboards we offer equipped with both our C.B. line and supervisory signals are known as Nos. 1000, 1100, AND 1200 STYLE VISUAL SIGNAL, FLOOR PATTERN and in introducing these Switchboards we have no hesitation in saying that they are far ahead of all other Visual Signal Switchboards on the market. In addition to providing DOUBLE POSITIVE SUPERVISION, they possess another feature that will commend itself to telephone users, viz., the night bell circuit, which operates whenever a subscriber calls, also when on the completion of a conversation, the subscriber who originated the call hangs up his receiver.

The No. 1000 style is of 50 lines capacity, while the Nos. 1100 and 1200 are of 120 and 160 lines capacity respectively. Each style is stocked with the various equipments given in the tables attached, but Switchboards are always wired for full capacity. Equipments differing from those listed can be supplied if required, and jack or plug-ended junction circuits to any type of Exchange can also be fitted.

The Switchboard Cabinets are elaborately finished and made of thoroughly seasoned American Black Walnut, or Teak if for the Tropics, all material being dry kilned in our own stoves. They are built throughout in our own Factory, and the very highest grade of workmanship, and most modern machinery is employed in their construction.

The key-shelves are hinged and fitted with strong locks, the front and rear panels being removable; steel frames are provided in the Cabinets for mounting the signals and jacks.

The location and method of mounting every single piece of apparatus has been carefully studied, with the result that each is easily accessible, and firmly fixed.

A connector board is fitted in the rear of each switchboard for terminating all line circuits, the connectors are spaced well apart, and clearly numbered, ample space being provided for the outside cables.

Each Cord Circuit is equipped with a Combined Listening and Ringing Key, and a complete Operator's Telephone Circuit with Headgear Receiver, Breast-Plate Transmitter, Cord and Plug is provided, but a Suspended Transmitter or Hand Microtelephone in place of the Breast-Plate Set can be supplied if desired. A Hand Generator, Night Bell, and Switch also form part of the equipment. Space and wiring is provided so that a key for changing over from hand to power ringing generator or vibratory converter can be fitted when desired. A small Fuse Panel, together with all auxiliary apparatus used in connection with the circuits is mounted on a substantial wood strip located just above the Connector Board.

Our Visual Signal Switchboards are designed to work with a 22-volt battery, but as the best Transmission results can be obtained when the Subscriber's Transmitter is receiving from 40-50 milliamperes, the number of cells forming the Battery may be reduced when all the lines are short; 12 volts, however, should be the lowest voltage employed.

Code No. Line Circuits Cord Circuits Height (ft in) Width (ft in) Depth (ft in)

50 Line capacity

1030 30 5 4' 1" 1' 9" 2' 1"
1040 40 6 4' 1" 1' 9" 2' 1"
1050 50 7 4' 1" 1' 9" 2' 1"

120 Line capacity

1160 60 7 4' 4" 2' 4" 2' 1"
1180 80 9 4' 4" 2' 4" 2' 1"
1100 100 10 4' 4" 2' 4" 2' 1"
1122 120 10 4' 4" 2' 4" 2' 1"

160 Line capacity

1200 100 10 4' 8" 2' 4" 2' 1"
1244 140 15 4' 8" 2' 4" 2' 1"
1266 160 15 4' 8" 2' 4" 2' 1"



No. 1300 Style
Central Battery Visual Signal Wall Pattern Switchboards

The Switchboard is fitted with our new type Visual Signal which acts both as a line and supervisory signal giving double negative supervision. That is to say, the Signals remain displayed during conversation, but immediately either or both the subscribers hang up their receivers the corresponding signal flags fall back out of sight.

We stock this style of Switchboard in the following sizes:- 10, 15, 20, 25, and 30 lines, but larger sizes can be made to order. To suit special requirements a number of ordinary line circuits can be modified to work as junction lines to magneto or C. B. Exchanges.

Specially selected American Black Walnut or Teak if for Tropical Switchboards is used for the cabinets, which are substantially made and have strong battens firmly attached to the rear of the backboard to keep the cabinets away from damp walls, also to provide space for the line wires to enter.

Connectors of the screw pattern to which the incoming lines will be attached are mounted on the backboard. The arrangement of the connectors has been carefully considered with a view to providing ample space for the line wires.

Each Switchboard Equipment comprises, in addition to the line circuits, a number of pairs of cord circuits equipped with Combined Listening and Ringing Keys, a complete Operator's Telephone Circuit, consisting of a C.B. Hand Combination Set with solid back Transmitter, Four-way Cord and Plug, powerful 4-Magnet Generator, Night Bell, and Switch, etc.

A No. 1330 is shown pictured to the right.

Code No. Line Circuits Cord Circuits Height (ft in) Width (ft in) Depth (ft in)
1310 10 3 1' 4" 1' 3" 1' 3"
1315 15 3 1' 6" 1' 3" 1' 3"
1320 20 4 1' 6" 1' 3" 1' 3"
1325 25 5 1' 8" 1' 3" 1' 3"
1330 30 5 1' 8" 1' 3" 1' 3"


No. 1400 Style
Central Battery Cordless Switchboards

Cordless Switchboards of our manufacture have, in addition to the usual advantages where only few lines are to be dealt with, various notable features, described hereinafter, which make them markedly superior to others of the same type. A No. 1410 is pictured to the right.

The line signal is used as a supervisory signal, but instead of the usual negative supervision obtained, our system gives POSITIVE SUPERVISION; that is to say, during a conversation the signals do not show, but at the conclusion the signals operate and indicate the fact, whereupon the operator restores the keys.

In addition to the usual night bell circuit which operates when a call is made, with our switchboards the night bell rings at the conclusion of a conversation, so that if there is no one in immediate attendance, an audible warning will be given to clear the connection, and there is thus no danger of stations being unable to call because they have been left connected through to another station.

These Switchboards are very well adapted for use as private branch exchanges with junction lines to a main exchange. For the junction lines, we use a self-restoring signal similar in appearance to the ordinary subscriber's line signal, instead of the usual drop shutter, which requires to be replaced by hand. Positive supervision is obtained over junction connections as well as when two local stations are conversing. Prices for these boards can be obtained on application.

Two sizes of cabinets are made having a capacity for 6 and 10 lines respectively, although each cabinet is always wired for the full capacity.

Mahogany for the Standard, and Teak for the Tropical Cabinets are used.

As with all our Switchboards, ease of access to every piece of apparatus has been specially studied, both back and front being hinged, and all the line connections are brought to terminals with screws and washers conveniently arranged, so that the connecting of the outside line wires can be very quickly and easily achieved.

In addition to line circuits, each Switchboard is supplied with an Operator's Telephone Circuit, comprising Desk Stand Telephone with C.B. Solid Back Transmitter, Receiver, 2 Conductor Cord, Hand Magneto Generator for ringing, and Night Bell Circuit with switch.
For the circuits employed on this Switchboard.

Code No. Line Circuits Connecting Circuits Height (ft in) Width (ft in) Depth (ft in)

6 Line Framework

1404 4 2 1' 3" 1' 3" 1' 3"
1406 6 3 1' 3" 1' 3" 1' 3"

10 Line Framework

1410 10 5 1' 5" 1' 4" 1' 3"


No. 1500, 1600, 1700, 1800 and 1900 Style
Central Battery Lamp Signalling Floor Pattern Switchboards

1500 1600 1700
1800   1900

The following description describes the features and advantages of our Standard Non-Multiple Lamp Signalling Switchboards.

Each Line Lamp Signal is situated immediately below the answering jack for that particular line, and the supervisory lamp signals are mounted with the associated key and plugs in the keyboard. For this reason, and also because a lamp is the best of all signals, these Switchboards are capable of being operated more accurately and rapidly than any other style of Switchboard, therefore we strongly recommend their use.

We know it is a general custom for manufacturers endeavouring to produce small central battery boards cheaply, to equip them with less efficient apparatus than they would fit on Multiple Switchboards. This practice we consider bad for all concerned, and we have in the design of our Non-Multiple Switchboards employed exactly the same apparatus and circuits as for our large C.B. Multiple Telephone Exchanges; we are, moreover, confident results fully justify our action.

In addition to our Regular Lamp Signalling Switchboards, No's 1500, 1600 and 1700 styles, in which the line lamps are operated by line relays, we list the Nos. 1800 and 1900 styles for use where the total resistance of the two wires forming the subscriber's line does not exceed 15 ohms. In this style of Switchboard the line lamps are connected directly in the line circuit, but are cut out when speaking. The line resistance in the case of the former style may be anything up to 700 ohms. Except for the above-mentioned difference, the Equipment of the two styles of Switchboards are identical.

Each style of Switchboard is stocked with the various equipments given in the tables, but Switchboards are always wired for full capacity. Jack or Plug-ended Junction Circuits to any type of exchange can be fitted, and equipments varying from those listed can be supplied if required.

American Black Walnut for Standard, and Teak for Tropical Switchboards, is used in the construction of the cabinets. The key-shelves are hinged and provided with strong locks; the front and rear panels are removable, and the plug shelves are covered with heavy sole leather to protect same from damage by the plugs. Steel Frames are provided for mounting the keys, answering jacks, and relays.

A Connector Board, with the connectors arranged so that the outside cables can be connected up with the greatest ease, is fitted at the rear of each Switchboard.

In the design of these boards care has been taken to provide easy access to all parts: in the case of the 1500 to 1700 Style Switchboards the line relays are mounted above the answering jacks, and not crowded in behind the cords. Panelled doors in the face of the cabinet with hinges and locks conceal these relays and permit of easy access to same.

The cord circuits are equipped with combined listening and ringing keys and double supervisory signal lamps. The Operator's Telephone Set consists of a Head Gear Receiver, Breastplate Transmitter, Cord and Plug; a Suspended Transmitter or Hand Microtelephone in place of the Breastplate Set can be provided if desired.

An efficient Hand Magneto Generator and a Night Bell and Switch are also fitted. Space, and wiring for a key for changing over from hand to power ringing generator or vibratory converter is provided. The supervisory relays, auxiliary apparatus in connection with the circuits, and a small fuse panel are located just above the connector board at the rear of the switchboard.

No. 1500, 1600 and 1700 Style
Central Battery Lamp Signalling Floor Pattern Switchboards with line relays

Code No. Line Circuits Cord Circuits Height (ft in) Width (ft in) Depth (ft in)

1500 - 60 Line capacity

1530 30 5 4' 6" 1' 9" 2' 7"
1540 40 6 4' 6" 1' 9" 2' 7"
1550 50 7 4' 6" 1' 9" 2' 7"
1560 60 7 4' 6" 1' 9" 2' 7"

1600 - 120 Line capacity

1660 60 7 4' 6" 2' 4" 2' 7"
1680 80 9 4' 6" 2' 4" 2' 7"
1600 100 10 4' 6" 2' 4" 2' 7"
1622 120 10 4' 6" 2' 4" 2' 7"

1700  - 160 Line capacity

1700 100 10 5' 2" 2' 4" 2' 7"
1744 140 15 5' 2" 2' 4" 2' 7"
1766 160 15 5' 2" 2' 4" 2' 7"


No. 1800 and 1900 Style
Central Battery Lamp Signalling Floor Pattern Switchboards without line relays

Code No. Line Circuits Cord Circuits Height (ft in) Width (ft in) Depth (ft in)

1800 - 60 Line capacity

1830 30 5 3' 7" 1' 9" 2' 7"
1840 40 6 3' 7" 1' 9" 2' 7"
1850 50 7 3' 7" 1' 9" 2' 7"
1860 60 7 3' 7" 1' 9" 2' 7"

1900  - 160 Line capacity

1960 60 7 3' 11" 2' 4" 2' 7"
1900 100 10 3' 11" 2' 4" 2' 7"
1922 120 10 3' 11" 2' 4" 2' 7"
1944 140 15 3' 11" 2' 4" 2' 7"
1966 160 15 3' 11" 2' 4" 2' 7"





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Last revised: August 05, 2019