Switchboard

Ten-line telegraph switchboard for interconnecting teletypewriter station lines and trunk circuits. Line transmission is neutral. Connections established by patching cords. Conference connections may be established. Operator uses Teletypewriter TG-7. Contains bias measuring equipment for use in adjusting the mechanically "biased" neutral line relays. Three boards (lines not multiplied) may be operated as a single installation and by improvised field arrangement more than three have been operated together. DC for power lines, trunks and local circuits obtained from rectifier RA-43. Part of Telegraph Central Office set TC-3.

Line unit

To connect neutral circuit to a teletypewriter. Include line relay, line current rheostat and meter. Line relay is adjusted to compensate for bias of incoming line signals. Bias meter I-97 used in making adjustment. Part of Teletypewriter Sets EE-97 and EE-98.

Line unit

Same as line unit BE-77 except that the bias measuring feature is included in the unit and separate bias meter is not required. Part of Teletypewriter Sets EE-97, EE-98, EE-102 and Reperforator Teletypewriter Sets TC-16 and TC-17. Line unit BE-77-B same as BE-77-A except for minor apparatus difference.

Repeater (terminal)

DC telegraph terminal-type repeater used for making connections from two-path polar or polarential line circuits to neutral type local circuits such as used in teletypewriters, Switchboard BD-100, Line Unit BE-77-A and to Telegraph Terminal CF-2 when long polarential circuits are employed. Contains built-in rectifier for operation on 115 or 230VAC and also contains a built-in manual telegraph set. Is supplied with a 115Volt power receptacle for supplying teletypewriter motor. Test Set I-193 is used for testing and adjusting the polar relays. Part of Repeater set TC-18 (terminal).

Repeater (intermediate)

DC telegraph intermediate-type repeater for retransmitting signals from one polarential line section to another polarential line section (differential sending only). Does not retime or reform signals. Will operate unattended on dry cell or storage battery supply when a teletypewriter is not required. Provides operating with a local teletypewriter when power supply is 115 or 230VAC. Has built-in rectifier for AC operation and also contains a built-in manual telegraph set. Test Set I-193 used for testing and adjusting the polar relays. Part of Repeater Set TC-19 (Intermediate).

Telegraph set

Manual telegraph set consisting of telegraph key, line relay, oscillator (howler) and telephone headset. Is equipped with a "call" bell. When headset is connected, the oscillator provides a tone in the headphone receiver of about 1000cycles which is under control of line relay. Line relay operates on about 1,5mA and has air-cap and spring-tension adjustment.

Telegraph set

Same as telegraph set TG-5-A except box is steel instead of aluminium and line relay is more sensitive (0,2mA minimum operating current). Line relay has spring tension adjustment only.

Telegraph terminal

Voice frequency carrier telegraph terminal providing four 2-way telegraph circuits. Two bays (2 circuits per bay) required for four circuits. Each bay contains rectifiers to supply DC for operating of the DC loop circuits and local circuits in the bay. Each bay contains a relay test circuit. Frequency range is 500 to 1050 cycles. The DC loops provide for neutral (half & full duplex) and polarential and polar circuits. For operating with Telephone terminal Set TC-21. Part of Telegraph Terminal Set TC-22

Telegraph terminal

Voice frequency carrier telegraph terminal with four circuits in one bay and essentials the electrical equivalent of Telegraph Terminal CF-2-A. Part of telegraph Terminal TC-22

Telegraph terminal

Voice frequency carrier telegraph terminal containing two circuits for use primarily in combination with Telegraph Terminals CF-2 to provide Channels 5 & 6. The DC loop circuits are like those is Telegraph Terminal CF-2-B. When used with CF-2 equipment, frequency range is 340-2400 cycles.

Telegraph terminal

"Speech-Plus Duplex" (D + DX) equipment.  Derives one carrier telegraph circuit from a telephone circuit while retaining the voice circuit. Separation of speech and telegraph by hand elimination filters which block out about 1500 to 2000 cycles for telegraph use. Frequency band passed by filters centered at 1680 cycles for one direction of transmission and 1860 cycles for the other direction. DC loops are neutral, half and full-duplex, polarential or two-path polar. Ringing may be voice frequency, 20 cycles or DC.

Key Typing Perforator

Receiving only

Receiving only

Teletypewriter

Page-receiving and keyboard-sending teletypewriter. "Standard" communication keyboard and type-bar arrangement. Pulling magnet selector and no line relay. Series AC governed motor operating on 25, 40 (TG-7-B only) 50 and 60 cycles 115VAC and 115VDC. Motor controlled by switch or automatic built-in control. Motor speed adjusted for 368 or 404 o.p.m. by use of proper tuning fork. The TG-7-B is the same as TG-7-A except that certain minor features not required is tactical services have been omitted. Part of Teletypewriter Sets EE-97, EE-97-A, EE-98, EE-98-A and Telegraph Central Office Set TC-3.

TT-7 / TT-8

Teletypewriter

Same as TG-7-B except equipped with keyboard and type-bar symbols for communication and for sending and receiving of "weather" information. Part of Teletypewriter set EE-102

Reperforator transmitter

Perforates and types message on the tape from keyboard locally or from line signals and send signals from tape run thru transmitter. Typing perforator with keyboard and transmitter distributor mounted on a common wood base which is also the base of the carrying case. Reperforator equipped with "standard" communication keyboard and type-bar symbols. A jack box mounted on the base provides a means of making connections to 60mA neutral circuits. Reperforator supplied with pulling magnet and no line relay. Motors are series AC governed type adjustable for 368 or 404 o.p.m. Motor switch control. Part of Perforator Teletypewriter Set TC-16.

Reperforator transmitter

Same as Reperforator Transmitter TG-26 except equipped with reperforator with keyboard and type-bar symbols for communication and for the sending and receiving weather information. Part of Reperforator Teletypewriter TC-17.

Perforator set

For perforating tape locally only communications keyboard. Mounted on a metal table which also mounts rectifier to supply DC for perforator solenoid.

Perforator transmitter set

Perforates tape locally only and tape is run thru transmitter which sends message. Uses same perforator as Perforator Set TG-11. Both units are mounted on a metal table which also mounts rectifier for operating solenoid of perforator. Series AC governed motor used in transmitter-distributor. This equipment is commercial, "substitute standard". Stop gap for TG-26

Perforator transmitter set

Reperforates tape (without typing) from incoming line signals only. Tape is run thru transmitter which sends message. Equipments mounted in a metal table which also mounts rectifier to provide DC from local circuits. Both units equipped with series AC governed motor with switch control. This equipment is commercial, "substitute standard". Stop gap for TG-26.

Telegraph Central Office Set

Major components:
Switchboard BD-100
Teletypewriter TG-7-A
Rectifier RA-43
Power unit PE-75
Ground Rod GP-29

Perforator teletypewriter set

Major components:
Reperforator Transmitter TG-26
Rectifier RA-87
Line Unit BE-77-A
Ground Rod GP-29

Perforator teletypewriter set

Major components:
Reperforator Transmitter TG-27
Rectifier RA-87
Line Unit BE-77-A
Ground Rod GP-29

Repeater set (terminal)

Major components:
Repeater TG-30
Ground Rod GP-29

Repeater set (intermediate)

Major components:
Repeater TG-31
Ground Rod GP-29

Telegraph terminal set (carrier)

Major components:
Telegraph Terminal CF-2
Maintenance kit ME-75

Teletypewriter set

Major components:
Teletypewriter TG-7-A
Rectifier RA-37
Line Unit BE-77
Ground Rod GP-29
Power Unit PE-77

Teletypewriter set

Major components:
Teletypewriter TG-7-B
Rectifier RA-87
Line Unit BE-77
Ground Rod GP-29
Power Unit PE-77

Teletypewriter set
Same as Teletypewriter Set EE-97 except power unit is omitted

Teletypewriter set
Same as Teletypewriter Set EE-97-A except power unit is omitted

Teletypewriter set
Same as Teletypewriter Set EE-97-A except Teletypewriter TG-37-B is issued in place of  TG-7-B and power unit is omitted.

I-193-A Test set

Polar relay test set. For testing and adjusting W.E.Co. telegraph polar relays 255A, D-163119A and D-164618. Includes special adjusting tools for these relays. Test set also provides source of 10 or 20 cycles “open-and-closed” signals for lining up the X-61822 carrier telegraph system. Cords supplied for connecting to DC power source, or to rectifier such as RA-37 or RA-87. Power required, 10 watts, 115-130 VDC. 

TS-2/TG Test set

Portable teletypewriter signal distortion test set for sending normal and distorted (up to 50%) test signals for checking the quality and for lining up teletypewriter equipments, regenerative repeaters and teletypewriter circuits. The signal send from motor-driven cams by an AC series governed motor, adjustable for speeds of 368 or 404 cpm. Test signals may be a test message, repeat space, R or Y. Equipped with jacks and resistors to provide 60 mil local circuit (DC power from external source) for checking performance of teletypewriters. Power input requirements: 150 VA at 115 VDC 50/60 cycles AC for motor power; 7W at 115VDC for local test circuit.

Teletype Corp. No DXD-1

Signal distortion test set for use largely in maintenance depots and repair shops. Test signals transmitted from set may be distorted from 0 to 100%. Signals measured by means of a strobosope containing a small neon lamp. Transmitted signals are test message, R and Y, A

Teletype Corp. No DXD-4

Same as Teat Set DXD-1 except arranged to send “blank” T, O, M, V or “letters” signals in addition to the test message, R and Y signals. Supplied with all required cords. Motor unit and gears are ordered separately.

Teletype Corp. 103628

Tuning Fork, 87.6 VPS tuning fork for use in adjusting speed of teletypewriter motor to American Standard of 368 OPMI.

Teletype Corp. 104984

Tuning Fork, 96.19 VPS tuning fork for use in adjusting speed f teletypewriter motor to British Standard of 404 OPM.