Burning Mirror and an Antifriction Device
A focusing mirror converging its rays and an antifriction bearing, amid columns and mechanisms
The sheet gathers several distinct studies. At the top a curved 'burning mirror', lettered a b c d, is shown gathering reflected rays to a focus along the line e f. A second note labels an antifriction device (f, m, n) with the maxim that every motion weighs along the line of its course. Around these are drawn a large triangular compass frame, decorated columns, and a wheel set with balls in a circular race that embodies the antifriction idea.
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Burning mirror concentrating its reflected rays
The figure lettered a b c d is a burning (concave) mirror, and the line e f is described as the meeting-point of its rays. The sequence a - e - b - d - f - c marks the geometry by which the reflected light is brought to a focus.
Antifriction device; motion weighs along its line of travel
A device lettered f, m, n is labelled an antifriction mechanism. The accompanying maxim states that every motion weighs along the line of its own course.
Wheel running on balls in a circular race
Near the lower center a wheel is drawn seated in a ring set with rolling balls, an antifriction bearing that realises the note on friction. A large triangular compass or A-frame stands beside it.