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.
Clocks No's 74B, 76B
General purpose wall mounted clocks . These clocks were specially designed to be suitable for use with any type of decor. The cases are circular, spun aluminium, finished in polychromatic
silver/grey. The clocks are mounted by means of mirror plate suspension. The dials are white, with black markings in the hour positions, but no numerals.
| No. |
Overall dia. |
Dia. of dial |
Depth (back to front) |
| 74 |
9in. |
7.75in. |
3in. |
| 76 |
12in. |
10.5in. |
3in. |
| 78 |
18in. |
16.25in. |
3.25in. |
| 80 |
24in. |
21.75in. |
3.5in. |
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.
CLOCKS No's. 74A, 76A, 78A and 80A
General purpose wall mounted clocks. These clocks were specially designed to be suitable for use with any type of decor. The cases are circular, spun aluminium, finished in polychromatic
silver/grey. The clocks are mounted by means of mirror plate suspension. The dials are white, with black markings in the hour positions, but no numerals.
Drawing No. P/T 10011.
Clock No. 74A
Clock No. 74B
Clock No. 74B
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