Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 129
e,called the circumference, every part of which is equally dis-tant from a point within, called the center. 15. The diameter of a circle is a straight line passingthrough the center, terminating at the circumference. 16. The radius of a circle is a straight line drawn fromthe center to the… … 126 THE LEVER ESCAPEMENT. 19. An angle is measured by the number of degrees con-tained between the two straight lines which form it. 20. A tangent to a circle is a straight line which touchesthe circle at only one point, and is always at right angles toa radius drawn to that point. 21. When two or…
Clocks and watches
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