PO ENGINEERING INSTRUCTIONS
MISCELLANEOUS
TIME
B 1321
Issue 5, Oct 1970
CLASS A (PULSE) CLOCKS
This is one of the standard half minute pulse clocks at present used by the
PO. The movements are described in B 1311.
CLOCK No. 86A
Double sided illuminated clocks for use in public office windows. One of the two 14" faces is of translucent material, illuminated from behind by a circular fluorescent tube. The general style
is similar to the standard range i.e. Clocks Nos. 74A to 80A. The case is of cast
aluminium with a polychromatic silver/grey finish, and uses conduit suspension.
Drawing No. P/T 10034.
No. |
Overall diameter |
Diameter of dial |
Depth (back to front) |
86A |
14.25 in. |
13.25 in. |
7 in. |
PO ENGINEERING INSTRUCTIONS
MISCELLANEOUS
TIME
B 1361
Issue 4, Oct 1970
CLASS B (SYNCHRONOUS) CLOCKS
One of the standard synchronous clocks at present used by the PO. The movements are described in B 1351.
Synchronous clocks are suitable for use only in areas where the mains supply is reliable. The basis for provision is given in B3001. The types used in the
PO are all non self-starting for use on a supply of 200-250 volts ac, single phase, 50 Hz, with a frequency which is time controlled. They should not be installed where
time keeping is of vital importance.
Clock No. 86B
Double sided illuminated clocks for use in public office windows. One of the two 14 in. faces is of translucent material, illuminated from behind by a circular fluorescent tube. The general style
is similar to the standard range i.e. Clocks Nos. 74A to 80A. The case is of cast aluminium, and uses conduit suspension.
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