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" Try to fire paper with a burning-glass : if it be white, you will not easily burn it ; but if you bring the focus to a black spot, or upon letters, written or printed, the paper will immediately be on fire under the letters. Thus, fullers and dyers find... "
Narrative of the Operations of a Detachment in an Expedition to Candy, in ... - Page 108
by Arthur Johnston - 1810 - 138 pages
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Essays and Letters, Volumes 1-2

Benjamin Franklin - 1821 - 232 pages
...will be quite hot to the touch, the white still cool. Another: Try to fire paper with a burning-glass. If it is white, you will not easily burn it; but if...in a black mug set before the fire, than in a white un' ' , or in a bright silver tankard. My experiment was this: I took a number of little square pieces...
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American Mechanics' Magazine, Volume 2

Technology - 1825 - 314 pages
...out equally wet, dry in the sun much sooner than the white, being more readily heated by the su;-'s rays. It is the same before a fire, the heat of which...sooner penetrates black stockings than white ones, and is apt sooner to burn a man's shins. Aleo beer much sooner warms in a black mug set before the fire,...
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Endless Amusement: A Collection of Nearly 400 Entertaining Experiments in ...

Fireworks - 1839 - 230 pages
...quite hot to the touch, and the white still cool. Try to fire paper with a burning-glass ; if it be white, you will not easily burn it ; but if you bring...sooner warms in a black mug set before the fire than a white one, or in a bright silver tankard. Take a number of little square pieces of cloth from a tailor's...
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Endless amusement; a collection of entertaining experiments in various ...

Endless amusement - Fireworks - 1820 - 232 pages
...fullers and dyers find black cloths, of equal thickness with white ones, and hung out equally wet, dryin the sun much sooner than the white, being more readily...sooner warms in a black mug set before the fire, than a white one, or in a bright silver tankard. Take a number of little square pieces of cloth from a tailor's...
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