CLOCK No. 46
P.O. ENGINEERING DEPT.
Issue 2, 8.10.53
ELECTRICAL CLOCKS - PULSE TYPE
(a) Toggle T1 trails over the notched agate G1 and as the arc of the pendulum swing decreases, the toggle momentarily engages in the agate notch, causing contacts
C1 to make and complete the circuit for the pendulum drive-magnet
(b) Toggle T2 rides in the notched agate G2 and operates the 1 second spring-set C2 each time the pendulum swings to the left. C2 is normally adjusted to make for 150 ms., but this period can be altered by moving the agate to left or right.
(c) Pawl B rotates the count-wheel A one tooth for each complete swing of the pendulum. Every sixth tooth is deeply cut and allows pawl B to operate the 6 second spring set C3, by engaging the trip pawl D.
3. The three 1 second pulses every 6 seconds are derived from the normal
1 second pulses by the operation of spring-set F which is controlled by a cam-wheel situated behind wheel A. This spring-set
makes for 3 seconds in every 6 seconds.
Drawing No. 44 & 45.
Manufactured by Gents, Magneta Time Co. or Gillett and Johnson.
The Gents clock can be identified by two screws fixing the count mounting bracket.
Last revised: April 11, 2011