|The GPO/PO/BT had many publications that make excellent reference sources, some of
which are listed below. This is not a complete list - why not advise of the missing
Issued over a number of years and still going strong in 1972 were the
Educational Pamphlet series. Always called the "Draft Series",
these papers were distributed to staff who needed more basic knowledge on a
variety of subjects. The instructions for these EP's can be found in TI M6
ENGINEERING INSTRUCTIONS (EI)
Phased out when the GPO was split into the Post Office and Post Office Telecommunications
in 1969. The Post Office had Postal Instructions (PI) and Post Office
Telecommunication Instructions (TI).
EI's described the installation and maintenance of GPO apparatus, plant, offices, in fact
anything connected with the organisation.
TELECOMMUNICATION INSTRUCTIONS (TI)
Introduced on a rolling basis in 1969 the TI range included similar information as in the
EI range except that references to Postal information was omitted.
Inland Services Information System was a continuation of the TI series. ISIS was not intended to
replace the TI system which was phased out as information was deemed redundant.
Notes issued by the technical support department of each Telephone Region.
Issued in loose leaf style.
PABX MAINTENANCE NOTES
Notes issued by the PABX technical support department of each telephone region.
Issued in loose leaf A4 style.
A small booklet that was issued on a monthly basis discussing maintenance
problems. Issued nationally.
The Traffic Design of Telephone Exchanges
Issued in an EI sized file, this publication describes how traffic is dealt with
in all circumstances.
Schedules of construction, maintenance and indirect items.
Loose-leaf file describing allocation codes for each type of job.
The GPO/PO/BT produced many sales publications for telephones, switchboards and telegraph
etc. Most of these are in the PH, DL or CP range.
These were usually a white A5 card with the instructions printed on them. If a
information was needed (e.g. switchboard instructions) then a small booklet was produced.
These were in the A range which is the standard range for forms,