CLOCK No. 102

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. 102A
As Clocks No. 82A, but with 24 hour dials.  12 inch clock with a circular metal polychromatic silver/grey finish.

Drawing No. 10060.

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. 102B
As Clocks No. 82B, but with 24 hour dials.

Last revised: February 24, 2002