ENGINEERING INSTRUCTIONS
LINES
UNDERGROUND
C 3031
Issue 1
JOINT MARKERS AND MARKING POSTS
General
This Instruction gives details of the methods to be employed in marking the
positions of buried couplings and buried jointing chambers, plant provided
for military purposes is excluded from this Instruction.
Joint Markers
Normally the position of a buried jointing point would be indicated by joint
marker placed flush with the surface of the path or road and immediately
over the centre of the object to be marked. A length of 200lb or 400lb
galvanised iron wire should be attached to the coupling or chamber and
marker. Strands from scrap stay wire should be used for this purpose.
The different types of joint marker are:-
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Markers, Joint No. 1 for use in carriageways.
Made from Cast Iron with a finish of Dr. Angus Smith's compound.
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Markers, Joint No. 2 for roadways carrying light
traffic and footways. 2' of chain is supplied with each marker.
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Markers, Joint No. 3 for use in footways. These
are triangular in shape and can be set in the corner or at the edge of a
flagstone. Made from Cast Iron with a finish of Dr. Angus Smith's
compound (1933) or Bitumastic composition (1972).
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Markers, Joint No. 4 consists of an elliptical plate
bearing the letters G.P.O. and are suitable for attachment to a fence,
post or wall to denote to position of a subscribers leading-in pipe.
Fixing holes are top and bottom of the plate. Made of malleable
cast iron, with a Sherardised finish.
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Markers, Joint No. 4 (1972) consists of an circular plate
bearing the letters P.O. and are suitable for attachment to a fence,
post or wall to denote to position of a subscribers leading-in pipe.
Fixing holes are top and bottom of the plate. Made of malleable
cast iron, with a Sherardised finish.
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Markers, Joint No. 5 consists of an elliptical plate
(3" long x 2" high) bearing the letters G.P.O. and are suitable for attachment to a fence,
post or wall to denote to position of a subscribers leading-in pipe. It
has an oblong recess in the centre (probably to accept Figures, Marker, Post, No. 3).
Fixing holes are on both sides of the plate. Introduced circa
1953. Drawing -
CN1517.
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Markers, Joint No. 10 for use in carriageways.
Superseded the Markers, Joint No. 1. Marked with the letters
G.P.O. in 1954 and then marked PO in 1972.
Marking Posts
Where a joint marker may become an obstruction owing to wear of the
surrounding pavement or where it may be covered by subsequently-added layers
of macadam etc., the position of the buried jointing point should be
indicated by a Post, Marking, No. 2 placed opposite too spot and against a
boundary wall or fence.
Each marking post should be fitted with figures to indicate, in feet, the
horizontal distance of the joint from the post.
Figures Withdrawn (or omitted) for security reasons
In the interests of security, the distance figures were with-drawn from (or
not fitted on) marking posts on trunk and important cable routes during
World War 2.
These figures should be replaced (or fitted) as opportunity occurs, the
records made at the time of removal (or omission) being used for the
purpose, and preference being given to those routes where the absence of
figures is causing most inconvenience and delay.
The above instruction has additions.
ENGINEERING INSTRUCTIONS
LINES
UNDERGROUND
C 3031
Issue 6, 5.8.66
MARKING OF BURIED PLANT AND AMPLIFIER
POINTS IN JOINTING CHAMBERS
General
This Instruction describes the methods of marking the positions of buried
couplings, jointing chambers, polythene cable joints, and amplifier points
in jointing chambers. This Instruction not apply to plant provided for
military purposes.
Country roads
Buried plant situated along country roads should be marked by using a Post,
Marking No. 2. The post should be positioned, where possible, with
its long face parallel to the line of the track, so that the numerals face
the track along a line at right angles to it. It's position should be
chosen with care so that it will not be a source of danger to the public but
at the same time it should be readily visible. Normally a position
against a fence or hedge will be found most suitable.
The distance in feet from the post to the point immediately
above the plant should be displayed using Figures, Post, Marking No. 3.
These figures are fitted to the Holder.
Sufficient space has been provided on the holder to permit
the inclusion of the joint number or the letters AP as an aid to
identification of plant where it is considered desirable.
In situations where a Post, Marking No. 2 may become
concealed by foliage or grass, a Post, Marking No. 3 shown in Fig. 3 should
be used.
With the increasing use by local authorities of power
mowing, cases have occurred where machines have been damaged by partially
concealed marking posts. The use of alternative markers flush with the
ground is not usually practicable and the taller Post, Marking No. 3 can be
used with advantage in such situations.
Rural and suburban roads
In rural and suburban roads where marking posts may cause obstruction, the
Marker, Joint No. 10 can be used.
The Marker, Joint No. 10 should be sited against the fence
or kerb line and flush with the surface of the paving.
The arrow-head indented on the marker should indicate the
direction to the plant. Numerals should be fitted as described above.
Where the marker is sited immediately over the buried plant, numeral 0 and
blanks should be displayed on the marker.
Where buried plant is situated under artificial flagstones a
Marker, Joint No. 3 should be set in the corner of the flagstone which is
immediately above the buried plant. Alternatively, where a grass verge
exists alongside the paving, a Marker, Joint No. 10 may be sited in the
verge at the edge of the paving.
Service pipes
Where it is considered necessary to mark the point at which a service pipe
passes beneath a boundary wall or fence, a Marker, Joint No. 4 should be
fixed to the wall or fence immediately above the pipe.
Carriageway
Where buried plant exists in the carriageway and it becomes necessary to
renew the obsolete carriageway marker (Marker, Joint No. 1) a Marker,
Joint No. 10 or a Post, Marking No. 2 or 3 should be used in lieu, as
previously described.
Marking of amplifier points
Where Cases, Repeater Equipment No. 1 are provided in a jointing chamber it
may be desirable, when a well-defined address cannot be given, to mark the
jointing chamber to facilitate identification under unusual conditions. In
general, such markings will only be required on country roads and the Post,
Marking, No... should be used. The distance to the centre of the jointing
chamber cover should be shown and the letters AP replace the joint number on
the Holder, Figures No. 3.
Pictures
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Marker, Joint, No. 1
Drawing - CN1066
(Dated 1902) |
Marker, Joint. No. 10
Drawing - CN1336
(Dated 1954)
This supersedes the Joint, Marker, No. 1 |
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Marker, Joint, No. 3
Drawing - CN1067
(Dated 1933) |
Marker, Joint, No. 3
Drawing - CN1067A
(Dated 1972) |
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Marker, Joint, No. 4
Drawing - CN1068
(Dated 1938) |
Marker, Joint, No. 4
Drawing - CN1068A (Dated 1972) |
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Post, Marking No. 2 (left) and No. 3
(right)
No. 2 with GPO insignia introduced in 1914
No. 2 with PO insignia introduced in 1972
No. 2 with BT insignia introduced in 1987 |
Post, Marking No. 2 (left) and
No. 3 (right)
No. 3 introduced in 1954
Total height of No. 2 is 2' 6"
Total height of No. 3 is 3' 6" |
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Figures, Marker, Post, No. 3
on Holders, Figure No. 3 |
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Cable Marking Post
These were used on main trunk cable routes.
In some instances the distance from the marker was obliterated
during the second world war. |
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