DRAWING THE CYLINDER ESCAPEMENT.
All horological--and for that matter all mechanical--drawings are based
on two systems of measurements: (1) Linear extent; (2) angular movement.
For the first measurement we adopt the inch and its decimals; for the
second we adopt degrees, minutes and seconds. For measuring the latter
the usual plan is to employ a protractor, which serves the double
purpose of enabling us to lay off and delineate any angle and also to
measure any angle obtained by the graphic method, and it is thus by this
graphic method we propose to solve very simply some of the most
abstruce problems in horological delineations. As an instance, we
propose to draw our cylinder escapement with no other instruments than a
steel straight-edge, showing one-hundredths of an inch, and a pair of
dividers; the degree measurement being obtained from arcs of sixty
degrees of radii, as will be explained further on.
In describing the method for drawing the cylinder escapement we shall
make a radical departure from the systems usually laid down in
text-books, and seek to simplify the formulas which have heretofore been
given for such delineations.
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