CLOCK No. 32

P.O. ENGINEERING DEPT.
ENGINEERING INSTRUCTIONS
MISCELLANEOUS
TIME
B 1324
Issue 1, 8.10.38

ELECTRICAL CLOCKS - IMPULSE TYPE
Clock No. 32

1. Description
Clock No. 32 is provided for synchronizing 1-second dial clocks in conjunction with Clocks Nos. 30 and 36 (see B 1304). The clock is illustrated in Figs. 1 and 2 and is connected in circuit in the manner indicated in diagrams GMT 26, 34, 35, and 36.

2. Operation
One-second impulses from the pulse distribution circuit energize the electromagnet M attracting the armature A to the left. To an extension of the armature is attached a spring controlled pawl P, which rotates a propelling wheel R, one tooth for each impulse received. To the arbor of this propelling wheel are attached two disks Dl and P2; the foremost disk Dl rotates once a minute, and disk P2 once an hour. In the periphery of each disk is a V-shaped notch situated at the index 60. Adjacent to these disks is a contact Cl, which is normally closed in all positions of the disks except when the two notches are in alignment. The contact Cl is then broken and the circuit through the electromagnet is interrupted. The circuit remains broken until the Clock No. 30 reaches the hour, whereupon the circuit is completed by the release of the relay which provides an alternative circuit for driving the Clock No. 32. Contact Cl is remade upon receipt of the next impulse.

Last revised: June 16, 2003