On the Doubling of Lights, with Sketches
A note that two four-ounce lights joined appear to make eight, amid indeterminate figures
A note headed "On the doubling of lights" reasons that if one light is 4 ounces, two such lights joined appear to make 8 ounces — treating brightness as if it simply added. Above the text are indeterminate red-chalk figures: a circle crossed by radiating lines beside a hatched, grid-ruled trapezoid, with a small funnel-like shape sketched below. e-Leo labels the drawings as indeterminate figures.
On this page
The doubling of the brightness of lights
The heading announces a discussion of the duplication of lights. If one light is taken as 4 ounces, then joining two such lights seems to yield 8 ounces of light, presenting brightness as though it added directly.
Additive reckoning of two lights
The reasoning is arithmetical: a single light valued at 4 ounces, doubled, is said to appear as 8 ounces. Two equal quantities are simply summed to give twice the measure.
Indeterminate geometric figures
At the top of the page a circle is crossed by radiating lines and a sweeping curve, set beside a hatched, grid-ruled trapezoid. A small funnel- or wedge-shaped sketch appears lower down. Their purpose is not stated.