CLOCK No. 15
|P.O. ENGINEERING DEPT.
Issue 1, 27/10/38
WATCHMAN'S PORTABLE TELL-TALE CLOCK
"Universal" type is shown pictured to the right
There were three types of tell-tale clocks, in use, viz., the "Universal," the "Newman" and the "Dent."
The "Universal" clock is enclosed in an aluminium dust-proof case fitted with a lock and key and will work for 50 hours with one winding. The dial has a single hand indicating the minutes; the hours are shown through an aperture in the dial by a revolving disc. Black figures on white ground represent the hours from 6 a.m. to 6 p.m. and white figures' on black ground the hours from 6 p.m. to 6 a.m. An unlimited number of stations may be registered, a fresh numbered key being squired for every additional station. The record is continuous and is made upon a roll of paper slip contained within the clock. The revolution of the key in the operation of registering, presses the tape against a type wheel (not shown) and moves the tape forward one space ready for the succeeding impression. Once inserted and partially turned, a key cannot be with-drawn without completing the registration.
The type wheel is connected with the clock and prints the
time upon the tape, while the key marks its own number thereon. The
used tape may be withdrawn at any time by unlocking the clock and no
replacement is necessary until the whole roll of tape has been used up.
Last revised: November 05, 2022