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The movement had provisions for dial hands through the use of motion
works. So it was assumed a dial was contemplated, however there was no evidence of a dial
having ever been attached anywhere on the frame. Choosing the dial size proved to be more
challenging than would first appear. This photo shows the size I would have preferred if
there were no problems. |
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However, problems there were. The movement had several areas that could
not be covered with dial work. The winding squares were first amongst these. Furthermore,
the pendulum and it's suspension were to be positioned behind the dial, presenting other
points that would have to be avoided. Because of this, the dial also had to be easily
removed to gain access to the pendulum. This photo shows an alternate layout that was
appealing, but impractical. |
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This diameter met the clearance criterion, but was too large for my taste. |
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Since the former dial size was too large, the next size down that could be
used was this one. While a bit smaller than I'd liked, it was the best compromise I could
make given the circumstances. Ouside diameter is 11". |
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A paper mockup was made to ensure that all critical areas of clearance
were met. Note the position of the winding squares. |
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I had a good idea of what style I had in mind. I wanted a minimalist look,
to allow as much of the movement, escapement and pendulum to show. This is were I wanted
the focus to be. The dial used by William Congreve on his epicyclic clock filled the
criterion. The numbers had a nice, readable design. The dial was two toned with the
numbers being silver with the outer and inner rings brass. I thought this would add to the
readability of the numbers against the brass background of the movement yet minimize the
intrusion of the overall dial on the movement. |
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A pattern was developed on a CAD machine and a dial was cut by wire EDM. |
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Finished dial. |
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Dial installed on clock, before final polish and finishing. Notice how all
of the recreated parts and systems reflect the designs of the original maker. The
heart-shaped pendulum 'key hole' cutouts and dial hands match that of the center going
train frame design. The bell hammer support frames and pendulum suspension subsystems
match the curvilinear design of the two strike frames. |
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A close up of the dial work and movement behind after polishing. There is
a plethora of reflecting surfaces and shimmering movement. In the end, after the dial
and movement was completed, the dial size proved to be just right. |
