The development of 400-day clock pendulums 1882 to present day
Click on the pictures for a larger view.
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Lindsay traces the history of pendulum designs |
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1882, Starting with the Schatz Wintermantel which is
simply a flat disc, the 19th Century finished with Galleries
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At the turn of the Century, poor timekeeping due to the
suspension spring quality, lead to experimentation with temperature
compensation
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Gallery progression |
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The ball pendulum was developed during the period before WWI |
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Note the 3 ball Schatz version on the left
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After WWII. the ball pendulum became standard, Gustav Becker however continued with flat pendulums until the 1930's |
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The main innovation just before WWII was the invention
of the guide cup in the base to contain the pendulum
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This group represents perhaps less than 10% of the
designs but is a representative sample of the progression in types over
100 years
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This stream of ball pendulums has the expansion of the
balls leveraging from the top of the pendulum
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Top swinging
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Top swinging
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Here's the split where the Left hand branch has the
balls leveraged from the bottom
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Still adjusting from the top ring but leveraged below
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A much more stable assembly, the top swingers being a
bit rattly
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Amazing how the details change
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Post WWII showed a decline in quality with some brands
until they became totally plastic
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Home made versions at this end are most attractive
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some one offs here!
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Badische had the 3 ball or some consider 5 ball pendulum
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Grivolas, the French maker continued with flat pendulums with attractive decoration, this is the base model |
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Doug Minty adds his knowledge
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The Hauke temperature compensating unit can be adjusted
by moving the half discs
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Unusual 3 ball Hauke
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Henn cubic "balls"
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One of the bimetallic coils is a dummy on this Huber
temperature compensator
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Jahresuhrenfabrik tried various gallery designs, thi
sone with 3 pillars
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Here's one with 6 screwed pillars
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This one has steel pillars
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This one no screws
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A bit of lateral thinking with this JUF
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The early Schatz Wintermantel pre Gallery | |
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Attractive Kienzle temperature conpensation |
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Kundo cubic "balls"
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This Peterson figuring pendulum is very sought after
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Doug does the summing up and thanked Lindsay
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