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Often, a common tool appears that is somewhat of a mystery
because of its size. Initially, one might think it is
a manufacturer's display unit or an exceptional piece
of whimsy intended to exhibit an individual builder's
skill. The physical appearance of such an object is almost
always in scale (proportion) to the original object, and,
in most instances, the ability to copy the original's
function is the desired result of the building exercise. |
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The micrometer shown is such an example. Professionally
made, it has been assembled using pegged tenons and employs
correct wood orientation for its laminations to eliminate
warping. The timber appears to be European beech. The
micrometer barrel has been made to allow its free turning,
just as in a smaller example. There is also a finely cut,
oversized wooden thread and corresponding nut that allow
the main spindle to advance in the same manner as a regular-sized
micrometer. Close examination shows that the graduations
on the main body correspond to the metric system. For
example, the number two that is written on the body represents
two centimetres. The barrel is correctly marked with 100
lines representing 100 millimetres. The main spindle advance
is tied to the marked graduations, allowing proper coarse
readings to be taken. However, the barrel is not tied
to the main spindle advancement, so readings to the millimetre
cannot be verified. |
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