|Below are five master clocks used to control a series of slave clocks or
other mechanisms like bells or dynamos. These clocks do not fit into the main part of the
collection of tower or skeleton clocks or time locks. However, they still, with the
exception of the first two, share the general theme of being able to see the movement
works. The first photo is a Telechron Type A from the mid 1930's. Second a rare Telechron
Type C, the only example known, and was used in systems that operated in a DC voltage
environment. The next photo shows a side-by-side comparison of the Type A and Type C
(pendulum not shown on C). The third clock is a Telechron Type E from the early 1930's
meant to run in a partial vacuum. Very rare, and only one of two examples known, again
this being the only operational one. Fourth a Collin Wagner, 1886, France. A beautiful
example of the horological art. Jeweled movement with Wagner's swinging frame remontoire.
The only example known. Fourth a Hahl pneumatic, 1913 with spring remontoire and extra
electrical bell actuating complication. This clock used air pressure rather than
electricity to control the slaves. This mechanism is Rube Goldberg device to see in
The Telechron Type A helped bring about the standardization of electrical
frequency control throughout the United States allowing for clocks of all types to be
controlled by small, cheap synchronous motors which lead to the demise of pneumatic
systems like the Hahl in the United States.
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