Bookshelf Sam's Telecomms Documents Repository


Technical Manuals Post Office Information


Please see the note about Crown Copyright on the index page.

3000 Type Relay Data            Post Office data sheets on the 3000 Type relays.
Introduction (80 kB)
1970 Data Sheets (3896 kB) BR copy
1980 Data Sheets (3091 kB) Courtesy of Paul Ebling
ATW 22001 Symbols for Circuit Diagrams etc ATW 22001 Symbols Rules & Conventions: The Post Office standard for schematic drawings. Includes circuit symbols, component layout (eg tag numbering) and component designations for various functions. It incorporates the symbols from British Standard BS 530 (1948) which later became BS 3939 (1966) and then BS EN 60617. Courtesy of John Mulrane [2.8 MB]
Cable Pressurisation
Cable Pressurisation Alarm Circuits
Post Office Notes for Internal Students, "A short appreciation of the need for the awareness by all staff, both internal and external, of cable maintenance methods and aims." [159 kB]
ATW 600290 Pressurised cable alarm circuits, diagram for an exchange cable pressure alarm rack, courtesy of Graham Cox, [135 kB]
Also see this article by Drallim about pressurisation.
Connection of FAX & DAta Equipment Drawing SA 14 shows 'Connexion of facsimile and data equipment to PO lines': the methods of connection and demarcation points. A1 drawing. [241 kB]
Dial Adjustment & Maintenance
MAI No 25
MAI No 26
Dial adjustment and maintenance instructions for Trigger type (No 25) and Slipping Cam type (No 26) [816 kB and 1.2 MB]
Description and Adjustment of Dial Mechanisms Technical Instruction from 1928 Part 24A. Description and adjustment for Dials, Auto No 10 also Nos 1, 3, 6 and 8. Courtesy of Laurence Rudolph [3.8 MB]
Educational Pamphlets Draft Series
Electronics 1/2
Electronics 2/7
General 3/6
General 3/8
General 4/1
Radio 1/2
Telegraphy 4/1
Telegraphy 6/1
Telephones 1/1
Telephones 2/2
Telephones 3/1
Telephones 3/4
Telephones 3/11
Telephones 3/19
Telephones 4/1
Telephones 4/3
Telephones 5/1
Telephones 5/2
Telephones 6/1
Telephones 6/3
Telephones 6/4
Lines 3/4
Post Office educational pamphlets. An excellent introduction to telephony topics. Draft Series issued in typescript.
Electronics 1/2: Multi-electrode valves [832 kB]
Electronics 2/7: Push-pull Amplifiers [1.3 MB]
General 3/6: electromagnetic Indicating Devices [2.0 MB]
General 3/8: Main and Intermediate Distribtion Frames [2.6 MB]
General 4/1: Electro-acoustic devices [1.6 MB]
Radio 1/2: Radio Communication Services [945 kB]
Telegraphy 4/1: The Teleprinter No 7 [1.7 MB]
Telegraphy 6/1: Facsimile Telegraphy [1.0 MB]
Telephones 1/1: Local and Central Battery Telephones [2.2 MB]
Telephones 2/2: Magneto & C.B.S. Working [581 kB]
Telephones 3/1: Automatic Step System [442 kB]
Telephones 3/4: Ordinary Final Selectors [1.4 MB]
Telephones 3/11: Director Multi-Exchange Areas [559 kB]
Telephnes 3/19: Testing and guarding circuits [1.5 MB]
Telephones 4/1: Uniselector Mechanisms [1.8 MB]
Telephones 4/3: 2000 type two-Motion Selector Mechanism [2.4 MB]
Telephones 5/1: Automatic telephone dials (courtesy of Bill Sayer) [766 kB]
Telephones 5/2: Loop-Disconnect Pulsing - Elementary Treatment [294 kB]
Telephones 6/1: An Outline of the Public Telephone System [2.7 MB]
Telephones 6/3: Telephone Traffic [683 kB]
Telephones 6/4: Trunking and Grading [1.4 MB]
Lines 3/4: Protective Devices used in telephone and telegraph lines (eg fuse, heat coils etc) [1.2 MB]
Educational Pamphlets Final Series
General 2/1
Technical Electricity 1/1
Telephones 1/1
Telephones 2/3
Telephones 2/4
Telephones 3/1
Post Office educational pamphlets. Final series, fully typeset.
General 2/1: Standard Graphical Symbols [1.6 MB]
Technical Electricity 1/1: The Telephone Relay [1.2 MB]
Telephones 1/1: The Trunk Demand Service [342 kB]
Telephones 2/3: Automatic Telephone Circuit Elements [1.5 MB]
Telephones 2/4: The Automatic Telephone Dial [387 kB]
Telephones 3/1: Automatic telephone- Non-Director Multi-Exchange Areas [515 kB]
Engineering Instructions
T1012 Tester AT5422
Very few EIs remain in my collection, but I found this one by chance. It describes the Test Set usually installed at PABXs and small exchanges. [250kB]
Exchange Boundary Maps At one the time, the maps of exchange boundaries were freely circulated internally upon request. Here are some examples html document
Guide Notes (Customer Apparatus)
Ambassador Telephones
Hawk Cordless Telephone
Merlin Tonto
Premiere Call Connect
Sceptre 100
Senator 1 Call Connect
Special Range Telephones
Essential information for the installer and maintainer of subscribers' apparatus.
Ambassador Telephones [1.3 MB]
The Hawk Cordless Telephone [540 kB]
Merlin Tonto Personal Information Centre [2.4 MB]
Premiere Call Connect System (PMBX 12) [2.6 MB]
Sceptre 100 telephone [646 kB]
Senator 1 Call Connect System [1.5 MB]
Special Range Telephones [496 kB]
House Exchange System - Q-Diagrams In addition to public exchange systems the British Post Office also supplied intercom systems under the title House Exchange System. It was documented in a series of Q-diagrams. A numerical listing of the Diagrams can be found here
Key & Lamp Unit
 
SA/SAW 9154
SA 9156
SA/SAW 9157
SA/SAW 9228
SA 9154 - Key and Lamp Units Nos 2A and 10A 108 kB
SA 9156 Order Table Working with K&L Unit No 2A or 10A, and UAA SA9151 Up to 20 Exchange lines or PBX Extensions - 5 sheets.[760 kB]
SA 9157 Order Table Working with K&L Unit no 2A, Special Applications. This means various types of private wire - 9 sheets.[791 kB]
SA 9228 Jack Unit No 1B [74 kB]
London Code Change Two small reminders of the London code change on 6 May 1990: '071 or 081. Know London's Codes' and 'Remember the London code change on 6 May' [2.12 MB]
Loudspeaking Telephone No 4 User Instruction Card
National Number Groups Map Official map produced by BT in 2000 showing the national number groups for subscriber trunk dialling (STD). This was freely available for download from BT Wholesale in the early 2000s. Courtesy of Bill Sayer. Compare with the STD and Charge Group maps in the Other Documents section.[380 kB]
New Telephone Wiring System Guide to the design and installation of the plug and socket wiring system introduced following liberalisation of the telephone instrument market. Courtesy of John Hein. [579 kB]
Optical Fibres - Notes on Principles & Properties A concise explanation of fibre optic technology from 1980. 7 pages. Courtesy of Graham Fitton. [516 kB]
Precautions against Accidents Document Rg 41. Sound safety advice to outside plant staff from 1956. Covers working with poles, ladders, power plant, and other dangers. [2.2 MB]
PABX 1 & 2 Drawings
 
SAW 8102 Notes only
 
PABX 3 Drawings
 
SAW 81071
SAW 81510
SAW 81520 & Notes
SA 8153-1 & Notes
SAW 81532
SAW 81581 & Notes
SAW 81582
SAW 81600
SAW 81622
SAW 81631
The circuit drawings for various parts of a PABXs. SA is a schematic, SAW is a routed schematic with wiring instructions. Diagram Notes Courtesy of John Griffiths.
 
SAW 8102 Notes for Connecting Circuit: Selector & Line Finder for PABX 1 & 2 [557 kB]
 
PABX 3 Drawings & Notes
SAW 81071 Ringing & pulse Circuit for PABX Nos 1, 2 & 3 [229 kB]
SAW 81510 Extension Line & Finder (ATE Dwg No TG1713 based on AT8151) [190kB]
SAW 81520 1st Group Selector Diagram [118kB] Notes [35 kB]
SA 8153-1 Final Selector, earlier version Diagram [92kB] Notes [36 kB]
SAW 81532 Final Selector, later version [103kB]
SAW 81581 Exchange Line Circuit, earlier version Diagram [225kB] Notes [49 kB]
SAW 81582 Exchange Line Circuit, later version with pencil alterations for Railway use [194kB]
SAW 81600 2nd Group Incoming & Enquiry Selector [116kB]
SAW 81622 Inter-Switchboard line circuit both-way Manual-manual [194kB]
SAW 81631 Inter-Switchboard line circuit both-way dialling in from PMBX [168kB]
Relay Type 23
TI A2045 PO Preferred Relays
Type 23 Data Sheet
Type 23 Assembly Drawing CD2328
Telecomms Instruction A2045 contains a general description, coil data, curent performance, contact rating and data sheets [158 kB]
The Data Sheet lists the type of No 23 relays by contact action, showing min operating voltage, coil resistance and current ratings. [45 kB]
Drawing CD 2328 shows the mechanical assembly of the Type 23 Relay. [86 kB] All courtesy of Dick Landau
See also the ITT brochure
Region and Telephone Area Boundary Map BT map showing the Regional boundaries and area telephone manager's offices. Also indicates the locations of the Group Switching Centres. Courtesy of Bill Sayer [2.4 MB]
STD Code Book 1984
STD codes text alpha sort
STD codes text numerical sort
Corrections
STD Code Book Reading 1965
STD Code Book Tunbridge Wells 1976
STD Code Book Haddenham 1984
STD Code Book Stevenage 1978
STD Code Book Haywards Heath 1981
STD Code Book London 1982
STD Code Book Ryde, IOW 1979
STD Code Book Isle of Wight, 1983
STD Codes Reverse List 1968
A complete STD code book for 1984 converted to text from Haddenham & Long Crendon Issue 4. 22 pages [107 kB]
Two plain text files containing the raw data in tab-delimited form and sorted alphabetically and numerically. [99 kB each] and an update file containing corrections made since the first issue of 16 Jun 2010.
For comparison, image scans of the Reading STD Code Book for 1965 - uses the original letter codes. Courtesy of Rob Grant. 12pp [798 kB] and then the Tunbridge Wells Book for 1976, Courtesy of Remco Enthoven, 48pp [3.0 MB] and an image scan of the Haddenham book used to create the text versions above, 56pp. [2.5 MB]. Three from the collection of the late john Goldfinch: Stevenage 1978 50pp, [2.2 MB], Haywards Heath 1981 52pp [2.2 MB] and London 1982 56pp [2.2 MB]
STD Code books for Ryde 1979 and 1983 (renamed Isle of Wight), courtesy of Mike Ginger [2.4 MB & 2.7MB]
The reverse list is an internal document from 1968 and shows proposed charge groups as well as actual ones. Where only manual routing was possible there is no code against an exchange name. [3 MB]
System X - The Way Ahead A lavishly illustrated booklet issued to introduce staff to the concept and practices of the new electronic exchange System X. 80 pages with many colour photographs making it a LARGE FILE 11.1 MB
Technical Pamphlets for Workmen
 
Group A General

A1 Magnetism and Electricity
A2 Primary Batteries
A3 Technical Terms
A4 Test Boards
A5 Protective Fittings
A6 Measuring & Testing Insts
A7 Sensitivity of Apparatus
A8 Standard List of Terms
A9 Standard Graphical Symbols
A series of very informative booklets for Post Office staff. First published in 1919 and revised and reprinted up until the mid 1930s. Most are courtesy of Andy Banthorpe. Others from Mike Tyrrell and Hywel Clatworthy
 
A1 Magnetism and Electricity looks at the fundamental principles behind the telegraph and telephone. 1934 edition [1.4 MB]
A2 Primary Batteries explains the principle behind the Leclanché cell and it's derivative, the dry cell. Advice on maintenance and testing follows. 1936 edition [1 MB]
A3 Technical Terms is a glossary of the terms used in both telegraphy and telephony. 1929 edition. [1.5 MB]
A4 Test Boards is about the test facilities provided at exchanges for testing the incoming circuits. 1919 edition with 1928 updates. [1 MB]
A5 Protective Fittings covers lightnig protectors, heat coils, fuses and their mountings. 1935 edition. [1 MB]
A6 Measuring & Testing Instruments 1934 edition. [2.3 MB]
A7 Sensitivity of Apparatus defines the current characteristics of various types of telegraph instrument followed by a section about the variosu types of relay unsed in telephony. 1926 edition with corrections to 1932. [1.8 MB]
A8 Standard List of Terms and Definitions used in Telegraphy and Telephony. A compendious document of 54 pages divided into subject sections followed by and alphabetic index. 1934 edition. [1.8 MB]
A9 Standard Graphical Symbols Describes itself as a reprint of BS 530-1934, which must have been the forerunner of BS 3939, and the subsequent BS EN 60617. 1934 edition. [825 kB]
Group B Telegraphy
B1 Elementary Principles
B2 Telegraph Concentrators
B3 Morse Keyboard Perforators
B4 Quadruplex and Repeaters
B5 The Hughes Printing Telegraph
B6 The Baudot Multiplex System
B7 W. Electric Multiplex System

The Telegraphy group are mostly self-explanatory. There are brief descriptions for each in the repository's Telegraphy section.

[B1 346 kB, B2 1.3 MB, B3 1.8 MB, B4 334 kB, B5 395 kB, B6 349 kB, B6 556 kB]
Group C Wireless
C1 Wireless TX & RX
C2 Interference with Reception
The Wireless group reminds us that the Post Office was responsible for tracing interference to radio broadcasts. C2 gives sound advice about sources of interference and methods of curing them
C1 Wireless Transmission and Reception [2.9 MB]
C2 Interference with Reception of Broadcasting [1.2 MB]
Group D Telephony
D1 Elementary Principles
D3 Exchange Signals
D4 Mag Exchs Non-Mult
D5 Mag Exchs Mult
D11 CB Exchs 22 V
D13 Trunk Exchs
D14 Maintenance Man Exchs
D15 Tele Test Equipment
D16 Routine Test Man Exchs
D17 Int Cabling & Wiring
D18 Dis Cases etc
D19 Cord Repairs
D20 Superposed Ccts etc
D22 Units Amplifying
This group refers generally to manual telephony.
D1 Elementary Principles of Telephony [1.4 MB]
D3 Principles of Telephone Exchange Signals [941 kB]
D4 Magneto Exchanges Non-Multiple Type [2.0 MB]
D5 Magneto Exchanges Multiple Type [756 kB]
D11 CB Exchanges 22 Volts [1.3 MB]
D13 Trunk Telephone Exchanges [1.3 MB]
D14 Maintenance of Manual Telephone Exchanges [824 kB]
D15 Telephone Testing Equipment [2.0 MB]
D16 Rountine Testing for Manual Telephone Exchanges [1.2 MB]
D17 Internal Cabling and Wiring [650 kB]
D18 Distribution Cases, MDF and IDF [1.1 MB]
D19 Cord Repairs Both Instrument and Switchboard Cords [2.0 MB]
D20 Superposed Circuits, Transformers, Bridging Coils and Retardation Coils [802 kB]
D22 Units Amplifying [2.6 MB]
Group E Automatic Telephony
E2 CCI Working
E3 Keysending "B" Posns
Automatic Telephony never really got going with the Technical Pamphlets. Apart from E1 'Automatic Telephony' these two were the only ones ever issued, as far as I know.
E2 Coded Call Indicator Working [1.6 MB]
E3 Keysending "B" Positions [1.5 MB]
Group F Subscribers Apparatus
F1 Subs Apps - Common Battery
F2 Subs Apps - CBS No 1 System
F3 Subs Apps - Magneto System
F3 Appendix N-Diagrams
F4 PBXs CB System
F5 PBXs CB Mult No 9
F6 PBXs Magneto
F7 House Tele Systems
F8 Wiring of Subs' Premises
Covers everything from telephones to private branch exchanges (PBXs).
F1 Subscribers' Apparatus - Common Battery System [910 kB]
F2 Subscribers' Apparatus - C.B.S. No 1 System [1.3 MB]
F3 Subscribers' Apparatus - Magneto System [1 MB] Appendix of N-Diagrams [1MB]
F4 Private Branch Exchanges - Common Battery System [1.5 MB]
F5 Private Branch Exchanges - C.B. Multiple No 9 [973 kB]
F6 Private Branch Exchanges - Magneto System [1.2 MB]
F7 House Telephone Systems [457 kB]
F8 Wiring of Subscribers' Premises Digital recreation from Hywel Clatworthy's original. [375 kB]
Group G Power
G1 Mtce Secondary Cells
G2 Power Plant for Telecomms
G3 Mtce of Power Plant
G4 Telegraph Power Dis Boards
 
G1 Maintenance of Secondary Cells [713 kB]
G2 Power Plant for Telegraph and Telephony Purposes [1.1 MB]
G3 Maintenance of Power Plant for Telegraph and Telephony Purposes [2.2 MB]
G4 Telegraph Battery Power Distribution Boards [1.5 MB]
Group H Lines
H1 Open Line Constructn Pt 1
H2 Open Line Constructn Pt 2
H3 Open Line Maintce
H4 U/G Constructn Conduits
H5 U/G Constructn Cables
H6 U/G Maintenance
H7 Cable Balancing
H8 Power Circuit Guarding
H9 Electrolytic Action
H10 Conductor Constants
 
H1 Open Line Construction Part 1 wooden pole practices, insulators etc [926 kB]
H2 Open Line Construction Part 2 wiring, tools, terminations, jointing, etc [874 kB]
H3 Open Line Maintenance [812 kB]
H4 Underground Construction Part 1 - Conduits [1.4 MB]
H5 Underground Construction Part 2 - Cables [1.7 MB]
H6 Underground Maintenance [719 kB]
H7 Cable Balancing Avoiding capacitive unbalance - pair transpositions etc [540 kB]
H8 Power Circuit Guarding Protection against overhead power lines [849 kB]
H9 Electrolytic Action on Cable Sheaths Causes of corrosion and counter measures [784 kB]
H10 Constants of Conductors Used for Telegraph & Telephone Purposes [710 kB]
Group I Submarine & K Miscellaneous
I1 Submarine Cables
K3 Heating Systems
K4 Pneumatic Tubes
A few oddments at the end of the series
I1 Submarine Cables For those working on Cable Ships [772 kB]
K3 Heating Systems Covers (briefly) water and steam systems [618 kB]
K4 Pneumatic Tube Systems House Systems as used in shops for carrying cash and Ticket Despatch systems used in telephone exchanges [1.9 MB]
Telecommunications Instructions
B2009 LST 10 (Kirk)
B2820 Keyphones
F1011 Doric
F1012 Harmony
H 5189 PO Type 19 Relay
M0045 Card Callmaker
Again very few of these remain in my collection.
B2009 LST 10 Loudspeaking Telephone No 10, LST 10 (Kirk). [332kB]
B2820 Keyphones Keyphones with Code C DC signalling. [82kB]
F1011 Doric Amplifier and Loudspekaer No 11A, Doric [26kB]
F1012 Harmony Amplifier and Loudspekaer No 12A, Harmony [145kB]
H5189 PO Type 19 Relay Description, labelling, numbering and adjustments for the Type 19 Relay [149kB]
M0045 Card Callmaker Marketing Instruction, Card Callmaker [140kB]
Telecom Gold - A Quick Guide BT introduced an electronic mail service, Telecom Gold, in 1982, under licence from Dialcom in the USA. It linked into the Telex system and had a number of information providers. 100 pp 8.2 MB
TE & Loop Resistance A 140. Transmission Equivalents and loop resistance of loaded and unloaded cable circuits. 30kB
Transit Switching Centres A table of the transit switching centres, showing which group switching centres they served. A transcription from Telecomms Instruction A6 G4002 Appendix 3 by Bill Sayer, to whom thanks. 375 kB
User Guides
LST 4
Minimaster 3
Minimaster Installation
Pentara Plus User's Guide
Rapport Plus
Relate 250
Relate 300
Statesman
Tremolo
User Guides for Subscriber's Apparatus
How to use the Loudspeaking Telephone No 4. 2pp 16 kB
User Guide for the Minimaster 3 small exchange. 12pp 1.02 MB
Installation Guide for the Minimaster 3 small exchange. 10pp 303 kB
User guide for the Pentara Plus office key system. 24pp 1.2 MB
User guide for the Rapport Plus combined telephone and answering machine. 52pp 5.9 MB
User guide for the Relate 250 feature telephone with digital display. fold-out sheet 422 kB
User guide for the Relate 300 feature phone with digital display and 20 memory buttons. fold-out sheet 699 kB
User Guide for the Statesman telephone, Telephone number 9101 - part of the InPhone range 8pp 427kB
User Guide for the Tremolo Telephone, Telephone Number 9701, made by Northern Telecom - another of the InPhone range.1166 kB

Educational Material for Schools & Colleges

History of the Telephone Instrument A wall poster produced by British Telecom for use in schools. It shows various stages in the development of telephone instruments culminating in the push-button telephone. Reduced to A3 size 998 kB
The History of the Telephone A later wall poster for use in schools. It shows key milestones and dates in the development of telephony up until the early mobiles. Reduced to A3 size 1.6 MB
The Language of Success Saying the righ things at the right time. An A5 booklet from BT in 1991 that offers advice on making the most of your telephone calls both at work and at home. Courtesy of Mike Tyrrell. 36 pages 965 kB
Names & Dates for Students Lavishly illustrated history of telecommunications giving the significant events from 1500 to the 1980s with a short paragraph on each along with pictures of the personalities. Published in 1984. 20 pages 4.1 MB
Public telephones A 32-page booklet for schools telling the history of public phones from the early silence cabinets to the modern designs of the 1980s. Terrific pictures. LARGE FILE 12 MB
The Story of the Telephone A lavishly illustrated 47-page educational booklet issued for use in schools. It dates from the 1970s. LARGE FILE 14 MB

Sales & Marketing Material

Better Hearing Help the Aged advice leaflet sponsored by BT. Discusses hearing aids and other helps for those with hearing difficulty. 1.9 MB
Choose your modern telephone Illustrating the multiple colours of the 706 telephone range. 598 kB
Extension arrangements Plans 1, 1a and 4. Sales brochure DLA 100 describing the extension plans available for home installation. 551 kB
Post Office Datel Services Leaflet DLZ 9. Lists the various data connection services available in 1974, Datel 100 up to Datel 48k. 290 kB
Post Office Datel 200 Leaflet DLZ 902. Single sheet describing the low-speed Datel 200 service 'suitable where bureau type activities are involved. 511 kB
Telephone Service Leaflet DLX 1. Single sheet listing connexion charges and line rental with picture of the types of phone available 153 kB
The Trimphone Trimphone - A glossy foldout extollng the virtues of this iconic design and showing the various colour options. 881 kB
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