|PO ENGINEERING INSTRUCTIONS
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 and are both designed solely for use in the public offices of Post Offices.
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. 52B
These are octagonal clocks, in unpolished mahogany, for use in the windows and on the walls of public offices. The clocks have 12
in. dials, and unpolished mahogany case. Now superseded for new work by Clocks No
Clock 50A Drawing No. P/T 47, 91 & 93.
Clock 52A Drawing No. P/T 48
||Dia. of dial
||Depth (back to front)
PO ENGINEERING INSTRUCTIONS
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. 50A and 52A
Clock No. 50A is a double dial, and No. 52A a single dial, clock designed solely for use in the public offices of Post Offices. Both clocks are suitable for window mounting by means of horizontal or vertical suspensions
(Drgs P/T 103 and P/T 104) which are special
wrought iron brackets, designed to harmonize with the interior of the public offices. The brackets should be obtained locally and painted to match the colour scheme. Clock No. 52A is also suitable for wall mounting in public offices. Clocks
No's 52A and No. 50A are now superseded by Clocks No. 76A (single dial) and
82A (double dial) respectively.