Consequently, in designing a chronometer escapement
we must not only draw the parts to a certain form, but consider the
quality and weight of material to employ.
To illustrate what we have just said, suppose, in drawing an escape
wheel, we must not only delineate the proper angle for the acting face
of the tooth, but must also take cognizance of the thickness of the
tooth. By thickness we mean the measurement of extent of the tooth in
the direction of the axis of the escape wheel. An escape-wheel tooth
might be of the best form to act in conveying power to the balance and
yet by being too thin soon wear or produce excessive friction. How thick
an escape wheel should be to produce best results, is one of the many
matters settled only by actual workshop experience.
FACTORS THAT MUST BE CONSIDERED.
Even this experience is in every instance modified by other influences.
To illustrate: Let us suppose in the ordinary to-day marine chronometer
the escape-wheel teeth exerted a given average force, which we set down
as so many grains.
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