Tempus by Bernie Mesa


Download the TEMPUS Clock Booklet

Tempus technical functions

In a conventional clock, the oscillation period depends only on the hanging pendulum length, not its mass. In a rotary pendulum, the masses and their distance from the center determine the period. Once the period is defined, the gears’ sizes and rations can be calculated.

The TEMPUS pendulum weighs 5 pounds, its period is 4 seconds. A small electric pulse from a battery keeps the pendulum oscillation amplitude constant and therefore the timing constant. Every pendulum cycle advances the six petal Maltese cross through a ratchet wheel.

There are four gears between the pendulum and the clock dial, a worm and mating worm gear, an intermediate spur gear and the minute and gear. The hands are driven through a clutch to allow setting the time. Between the minute and hour hands is the standard 12 to 1 gear set. There are eight gears and five shafts in total. The shafts are mounted on miniature ball bearings for minimum friction.

Height in inches
Diameter in inches
weight in pounds
KODAK Digital Still Camera
KODAK Digital Still Camera

click above to watch

Here is a video showcasing the pendulum cycle advancing the Maltese cross through a ratchet wheel

View entire TEMPUS image and video gallery

Tempus by bernie mesa

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