CLOCK No. 86

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.

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.

Last revised: December 31, 2021