| Geology - 1834 - 502 pages
...Again," he says, '' 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." He further remarks, that fullers and dyers find black cloths,... | |
| Science - 1834 - 494 pages
...Again," he says, *' 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." He further remarks, that fullers and dyers find black cloths,... | |
| Benjamin Franklin, Jared Sparks - Statesmen - 1838 - 632 pages
...cool. Another. Try to fire the paper with a burning glass. If it is 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 black cloths, of equal thickness... | |
| Fireworks - 1839 - 230 pages
...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 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 black cloths, of equal thickness... | |
| Benjamin Franklin - 1840 - 640 pages
...cool. Another. Try to fire the paper with a burning glass. If it is 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 black cloths, of equal thickness... | |
| Benjamin Franklin - Inventors - 1853 - 522 pages
...you bring the s to n black spot, or upon letters, written or printed, the paptn- will immediately be on fire under the letters. Thus fullers and dyers...ones, and hung out equally wet, dry in the sun much nooner than the white, being more readily heated by the sun's rays. It is the same before a fire; the... | |
| Benjamin Franklin - Inventors - 1855 - 522 pages
...cool. Another. Try to fire the paper with a burning-glass. If it is 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 black cloths, of equal thickness... | |
| John Platts - Curiosities and wonders - 1876 - 986 pages
...still cool. " Another. 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 \\ill immediately be on fire under the letters. "Thus fullers and dyers find thatblack cloths, ofequal... | |
| Benjamin Franklin - United States - 1906 - 502 pages
...still cool. Another. Try to fire Paper with a burning Glass. If it is 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. apt sooner to burn a Man's Shins. Also Beer much sooner warms... | |
| Benjamin Franklin - Statesmen - 1927 - 324 pages
...still cool. Another. Try to fire paper with a burning glass. If it is 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 black cloths of equal thickness... | |
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