Metz, James
(2021)
The Tachymeter and the Hyperbola.
At Right Angles.
pp. 54-55.
ISSN 2582-1873
Abstract
A tachymeter (ta kim‘ i ter) is a scale on certain
chronograph watches that enables one to calculate
speed, where “speed” is the amount of work done
in one hour. The work can range from covering a certain
distance to manufacturing a number of items. With x as the
number of seconds/task and using the equation y = 3600/x,
some convenient values of y are placed around the watch dial.
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