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Master Clocks
  
| 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, one of two examples known, used mainly in systems that operated in a DC voltage
environment (currently under restoration). Third a Telechron Type E from the early 1930's
meant to run in a partial vacuum. Rare, and only one of two examples known, 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 operation. 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.
Click on the individual picture to see details of that
item.
 
 
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