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SELECTOR, GILL, MODEL....,  CODE....* [Form 2968]

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Installation of additional selectors, except on such sets as specifications provide them, must be approved by Vice Pres. Traffic before reqn. is written and the approval noted on the reqn. Reqns. for maintenance purposes must be approved by the head of department in charge of the maintenance. Used to close a local circuit by transmission of a predetermined set of direct current impulses over a line. An electromagnet whose armature drives a gear train in such a way that if its predetermined code is received, the train closes a contact, but if any other impulses are received, the contact gear drops out of step. Mechanism is set on a porcelain base and covered with a glass case. L--6", W--4", Ht--4"".

Model Resistance Current
  Series Parallel Series Parallel
D 8   100  
F 100 25 40 90

* If needed for a new office having no code assigned state "Code unassigned" and also whether for W. U. or railroad office.


John Casale sent a set of instructions for a Gill Selector that was used in O'Neill, Nebraska to get the attention of a Western Union operator via the gill selector in Omaha, Nebraska.

 SET, ADAPTER, 1-A.  [One set cares for two repeaters.]   Used to convert 25 and 52 volt duplex half repeaters into full duplex sets. Box with wood sides and metal front and back containing one WE 44-D retardation coil. The two parts of this coil are wired to 2-37-A call circuit switches mounted on one end of the box. 14 binding posts on rear/L--11", W--2 3/4", D--10 3/4".
SET, MORSE, LEARNERS.  For use in learning Morse telegraphy. A low resistance sounder (either 4_ohm 1_A or rewound 15_A M.L.) and a key mounted on a wooden base. Size approx. 8 3/4" by 4 5/8" x 3" high.
SET, MORSE, PORTABLE, 1-A. Used at sports events, etc., when a KOB set must be used out in the open in any kind of weather. A sheet metal box with hinged door at each end and a 15-B 120 ohm sounder and a 2-A legless key mounted in bottom. Key button is reached by opening door on one end. If semi-automatic key is to be used, set is turned upside down, door at opposite end is opened and "bug" is set on bottom and wedge placed in small jack on side. One door is hinged at top and one at bottom, both having side hoods to keep out rain. L--9 ", W--6 1/8", Ht--8 ".
SET, TELEGRAPH REPEATER, 2-A, .... OHMS.* Used on duplex half repeater sets for obtaining polar operation of main line with single Morse operation of drops. Two separate relay structures mounted on a wood base with iron subbase. One relay (left hand) acts as polechanger to send single Morse into duplex side, while other (right hand) is operated by polar line relay to send into single Morse side, and is termed the control relay. Furnished in 32 ohm (for 26 and 52 volts) and 150 ohm (for 80, 110, 160 volts) this being the resistance of the control relay with coils in series. L--12 3/8", W--5 3/8", Ht--5 ".  

* When changing local circuit voltage, complete new sets should be ordered.

SOUNDER,..., .... - OHM.  

Ordinary telegraph sounder for use on local circuits. Electromagnet with armature set on a pivoted sounding bar. Bar plays between two legs of U-shaped anvil, stop screws being provided for adjustments. Mechanism is set on wood base. Type 1-B has coils brought out separately to binding posts for either series or parallel connection.

 Type Resistance  Current  L  Ht
1-A 4 250  5 "  3" 3
  50 110                Same
1-B  400 (series) 30                    "
   100 (parallel) 60                      "
SOUNDER, AUTO SWITCH. See Repeating Sounder 3-A
SOUNDER, KOB, 16-AC or 16-C. A main line sounder without its wood base, set directly on a 9" x 6" by " wood base together with a legless key. Sounder has mechanism of 15-AC or 15-C types, which see. Used only for miscellaneous portable services. See #15 and #17 sounders and portable Morse Sets for latest data.
SOUNDER, MAIN LINE, 15-B, ... OHM.*sdr15b.jpg (49978 bytes)


Use on single Morse circuits for operation directly in main line instead of a local circuit. Generally similar to common sounder but of larger size. Coils are moveable horizontally so as to vary air gap between pole pieces and armature, thus compensating for varying line current. Furnished in 30 and 120 ohms, requiring 70 and 40 mils respec. L--5 ", W--3", Ht--4".

*15-A type now obsolete had adjustment screw on top of armature, this being only adjustment feature. Resistance 150 ohms.

SOUNDER, MAIN LINE, 15-C OR 15-AC. An older type of sounder now used only in KOB service. Air gap is varied by moving sounding bar trunnion up or down in arch, and spring tension is varied by thumb screw mounted in small brass box. 15-AC is 150 ohms (many of these are marked 15-A, but are of 15-C mechanical design) 15-C made in 25 and 100 resistance, current 70 and 40 mils respec.


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Used interchangeable with 15-B sounder. Adjustment of air gap is done by moving coils vertically from a thumb screw at one end.


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Used in local circuits where it is desired to repeat the signal into another circuit. Similar in size and general design to #1 sounder, but has contact screws on anvil end of sounding bar. #2 type makes on down stroke while #3 not only makes on down stroke but opens another circuit at same time.

 Type    Resistance Current Specn.
2-A  4 250  E-178-D
  50  110  E-178-D
2-B  400 (series)  30  767-B
  100 (parallel)  60  767-B
3-A  same as 2-B    1597-A

Used where it is desired that operator only shall hear signals. Miniature sounder set in watch case receiver on head band. Cord included.

Type  Resistance  Current
6230  500
6231  20  250
6232  150  50

Western Electric sold the 6A Secret Sounder


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Used by testing and regulating forces to transmit instrument sounds directly to the ear. Mahogany rod " by 18" with flat ear piece at one end.  (Additional pictures of Stick, Listening:  (View 2), (View 3)

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Used to stifle sounders on repeater tables or elsewhere when signals are not being read. Piece of spring bronze with projecting ears. Is mounted under sounder back stop screw and end can be swung over front screw to hold sounding bar down. Max dimension 1".
SWITCHBOARD, CABINET TYPE. A general name give to pin jack telegraph switchboards to which the equipment is assembled into a metal box or cabinet. This cabinet may be attached to the wall or be self-supporting on the floor. See also single and double circuit switchboards.
SWITCHBOARD, PEG. Superseded by single or double circuit switchboards, or cabinet type installations of pin jack equipment. A wooden frame on the face of which are vertical brass strips in pairs. Between each pair is a vertical row of brass discs having circular notches adjacent to similar notches in the straps. Each horizontal row of discs is connected together in the rear by a strip of copper. Line wires are connected to the top of the straps and instruments to the left ends of the strips. By inserting switch pegs 1-A in the proper notches, lines are connected through to instruments or to other lines.

A variety of switchboards were used.  They ranged from small models to very large ones.

SWITCHBOARD, SPRING JACK. Used only for emergency switchboard service. A peg switchboard with one or two pairs of jack contacts (at the bottom) in service with each strap. The jack consists of one stationary flat block and a hinged curved block normally held against the flat one by a spring, hence the name "spring jack." Insertion of a wedge cord connects the cord in series with the strap. Single spring jack boards have one jack per strap set vertically, while double spring jack boards also have another jack per strap set horizontally below the vertical jacks
SWITCHBOARD, UNIT, .... CIRCUIT .... [Order patching cords separately.]

Sheet metal case with moulded hinged face panel in which jacks are mounted. Protective apparatus is mounted in rear of panel on rear of panel and wires to line and instruments terminate on a block in bottom of box. Opening of hinged panel operates contacts on the block to cut line through and disconnect protectors and jacks, leaving these ports "dead" until panel is closed. Panel can be latched part way open to provide this condition during hours when office is closed. 

The units are made in two types, SINGLE and DOUBLE circuit. The first has one panel with five jacks (one for ground) and protection for one Morse wire passing through instruments. As shipped it has it has an internal strap cutting out the instrument leads making the wiring an "AK" circuit. The Double has two panels side by side in one box They are rigidly connected by iron straps, which can, if desired, be removed to open each panel individually. The internal strapping is such that connections can be set up for two telegraph wires or for the various ARA telephone                                                      Size: Single--W--4", Ht--6 3/4";D--6"; double--W==8 1/4", Ht--6 3/4", D--6"

SWITCHBOARD, UNIT, SINGLE CIRCUIT, UNPROTECTED, 3-B. A unit board without protective apparatus, formerly used in offices requiring no protection or in subscribers offices where equipment is so far from entrance that substation protector is desirable at that point. 

3-A unit had same construction as as 1-C, while 3-B is same as 1-D. 

Depth 3", otherwise same size as #1 unit.

TABLE, OPERATING, MORSE, #4 Types. Superseded by #11 type. Formerly used for Morse operating positions.
An angle iron framework with wood top, furnished completely knocked down. Assembles into double sided units 33" by 42" deep any number of which can be assembled together. For each group one Main Unit needed to provide end legs of table, with intermediate units to build up the size required. Main Unit can be recognized by fact legs span full width of table, while those of intermediate unit are only 18" apart. Main Unit top can be identified by 2 pieces 10" by 24", while intermediate includes 1 piece 24" by 42". Filebar 1-A was ordered separately to fit length of each table.
TABLE, OPERATING, MORSE, #10 Types. Superseded by #11 type. Similar in design to #4 types, but was only 24" deep for single sided use against walls etc.
TABLE, OPERATING, MORSE, 11-B* [Information only] A unit table used for Morse operating positions. Frameworks and tops must be ordered separately.
A framework consists of a boxlike skeleton structure (on which the top mounts) and one pair of legs. To complete each row of grouped units, one leg, Morse Table 11-B must be ordered, this item consisting of two uprights, one crossbar, feet, bolts, etc. Each framework, plus the top, provides one Morse position. Tops are linoleum covered, and section back of drop is in one piece so can be removed independently if wiring is to be changed. Front sections can be replaced without disturbing wiring.
Tables are to be set up back to back with 3" separation, this space being covered by a filler on which Filebar 1-A of the proper length is mounted.
*The first issues of this type of table were marked 1-A and had wooden tops.

Used on unit Morse tables #11 type.
An instrument board 8" x 33" of oak veneer, and a typewriter drop and two side panels of linoleum covered seven ply fir.

* First issues of these tops were of solid wood

TRANSMITTER, ATKINSON,....OHM  Used on Atkinson style single line repeaters. 

Mechanism like a repeating sounder with bar extended beyond trunnion piece to form mounting for a an insulated offset spring contact finger. Contact screw on a separately mounted post strikes finger as transmitter operates. In unoperated position finger touches insulated stud on turned-up end of bar. Has 2 separate 2-point lever switches on base to short out points.

Resistance Current
40 110
400 30

L--8 3/4", W--5", Ht--4 3/4"

TRANSMITTER, POLECHANGER, #3 and #4 TYPES. Used on polar operated key worked circuits for transmitting positive and negative battery to line. 

Two pairs of electromagnets facing each other with a single armature set between two spectacle type frames about 1" apart. 

#3 type has windings on all four coils connected in series. 

#4 type has each pair brought out separately, one pair to be used in a local circuit kept continuously closed. If all coils on a #4 type are connected together externally it is equivalent to a #3.

Type Resistance Current
3-B 8 250
  26 110
3-C 400 *30 (series) 60 (multiple)

*Coils in series--400 ohms; parallel--100 ohms.

The 4-A type, when used as such, has only half the above resistances, but has been referred to under the same values to allow interchangeability. Iron subbase 8 1/4" by 4 3/4". Overall Ht. 3 5/8".

TRANSMITTER, POLECHANGER, 5-A, ..... Generally similar to #3 and #4 types, but one pair of coils is replaced by a permanent magnet.

Note that resistances are one half those of #3 types.

Resistance Current
4 ohm 250
13 " 110
200 " 30
TRANSMITTER, QUAD,.... OHM, 1-A. Used on "common" side of quadruplex, on double loop repeaters, and on seconds beat service where a continuity preserving transmitter is desireable.

Much similar to Atkinson transmitter but has no contacts at anvil end, and insulating stud at other end is replaced by a contact. 40 or 400 ohm.

TRANSMSITTER, WEINY PHILLIPS, ....OHM. Obsolescent. Used only on Weiny Phillips single line repeaters.

Much similar to Atkinson transmitter but has flat contact spring and single pole double throw lever switch. Operating data same as for Atkinson transmitter. 40 or 400 ohm.

UNIT, CORDLESS TABLE JACK, 2-B Supersedes cordless jack boxes made up from 203-A jacks in suitable mountings.

Used on Morse tables to concentrate several wires before one position, and on simplex printer tables for test circuits. A two part metal box with 3 jacks set in a composition panel which forms front of box. Top, one side and rear of box are detachable in one piece to afford ready access for wiring. Jacks have springs equivalent to #203-A type, and sleeves are strapped by wire which can be removed when box is not to be used as a cordless jack (as on simplex tables). External connections can be made to either Fahnestock clips or soldering lugs.  W--3 1/2", Ht--2". D--4 3/4"

*Type 1-A unit (Specn. 971-A) is similar, except that it had screw terminals, and sleeves of all three jacks were built into a single brass plate, thus making it suitable only for cordless jack service. Type 2-A (Specn. 1808-A) has separate sleeves as in the 2-B type, but terminals are of the screw type as in the 1-A unit.

VOLTMILAMMETER, 7-A Used on telegraph switchboards for wire testing.  Round switchboard meter (Model 24) wired for use as voltmeter or milammeter (scale 200-0-200) without use of pushbutton to shift internal connections from volts to mils. Scale division unit is 5. Has binding posts at top and bottom and mounts on meter brackets #2 or #3.  Dia--7 1/4", D--4". Binding posts project 1 1/4".  

[NOTE:  The spelling of "voltmilammeter" and "milammeter" was copied from the book.]

WHEEL, CODE, 1-B, #.... [Form 2968]  

Used in call boxes for furnishing signal impulses. Two toothed brass discs mounted rigidly together. Movement of box gears cause pins of call box to engage tops of teeth as code wheel revolves. Wheels are coded to order in the following numbers, all inclusive. Numbers 512 and up shall be used only when lower ones cannot be used.

21 to 25 121 to 125 212 to 215  312 to 315 412 to 415  512 to 515  612 to 615
31 to 35       131 to 135 221 to 225 321 to 325 421 to 425 521 to 525 621 to 624
41 to 45       141 to 145 231 to 235 331 to 335 431 to 435 531 to 534 631 to 633
51 to 55       151 to 155 241 to 245 341 to 345 441 to 444 541 to 543 641 to 642
    251 to 255     351 to 354 441 to 453 551 to 552 651
ZINC, CROWFOOT.  gravbat.jpg (30524 bytes) For gravity Battery. Crowfoot shaped zinc casting. Center of foot having pedestal with brass thumbscrew binding post an hook for hanging from top of jar. Diameter 5 ", ht 3 ", wt 3 1/8 lbs.

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