CLOCK No. 64


PO ENGINEERING INSTRUCTIONS 
MISCELLANEOUS
TIME
B 1361
Issue 4, Oct 1970

CLASS B (SYNCHRONOUS) CLOCKS
Clock No. 64B

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. 64B
These are 12 in. single dial wall mounted clocks for general purposes. The cases are circular moulded synthetic resin with a golden beige finish. For new work, these clocks are now superseded by Clocks No. 78B.

Drawing No. P/T 177.


Taken from

P.O. ENGINEERING DEPT.
ENGINEERING INSTRUCTIONS
MISCELLANEOUS
TIME
B 1321
Issue 3, Jan 1959

ELECTRICAL CLOCKS - PULSE TYPE
Clock No. 64A

Clock No. 64A, which supersedes Clock No. 4A and Clock No. 18, is a Class A, 12 in. single dial wall-type pulse clock for general purposes. It has a circular, moulded synthetic-resin case, with a “Golden Beige” finish. The case is constructed in a reasonably substantial manner, but has not the strength of a wooden case, and care should be exercised in handling and installing. Clocks No. 4A and Clocks No. 18 will continue to be issued as long as they are available.

When a Clock No. 64A is fitted in an exposed position, the movement and dial should be removed and the glass made damp-proof with a thin layer of putty between the glass and case if considered necessary.

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