 In the ordinary process of photometry the standard used is a candle, defined by Act of Parliament as a " sperm of six to the pound, burning at the rate of 120 grains per hour.  Journal of the Franklin Institute - Page 236by Franklin Institute (Philadelphia, Pa.) - 1866Full view - About this book
 | Edmund Burke - 1869 - 652 pages
...of light. In ordinary photometry the standard used is a candle, defined by Act of Parliament (!) as a " sperm of six to the pound, burning at the rate of 120 grains per hour." The performance of euch a rude test could hardly be but, what it generally was, fallacious ; for candles,... | |
 | 1895 - 664 pages
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 | William Somerville Orr - 1856 - 596 pages
...candles should be, for they range in combustion between 120 and 146 grains per hour. A spermaceti candle of six to the pound, burning at the rate of 120 grains per hour, is generally taken as the standard of comparison for all other illuminating agents, for the light emitted... | |
 | 1866 - 642 pages
...light of M-ax and sperm was as 14 to 16— in other words, the power of sperm was just one-seventh greater than that of wax. At present, the standard...sperm of six to the pound, burning at the rate of no grains per hour. But for some time past this standard has also become uncertain — first, because... | |
 | 1866 - 636 pages
...light of wax and sperm was as 14 to 16 — in other words, the power of sperm was just one-seventh greater than that of wax. At present, the standard...sperm of six to the pound, burning at the rate of i го grains per hour. But for some time past this standard has also become uncertain — first, because... | |
 | Charles Knight - 1866 - 568 pages
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 | 1867 - 774 pages
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 | William Renwick Bowditch - 1867 - 340 pages
...candles should be, for they range in combustion between 120 and 146 grains per hour. A spermaceti candle of six to the pound, burning at the rate of 120 grains per hour, is generally taken as the standard of comparison for all other illuminating agents, for the light emitted... | |
 | Henry Banister (writer on gas.) - 1867 - 212 pages
...better than the standard burner. All existing Acts of Parliament define it as a " sperm candle of 6 to the pound, burning at the rate of 120 grains per hour." A true sperm candle is made from a mixture of refined sperm oil with a small proportion of wax sufficient,... | |
 | 1869 - 204 pages
...In the ordinary process of photometry the standard used is a candle, defined by act of parliament as "a sperm of six to the pound, burning at the rate of 120 grains per hour." This test Professor W. Crookes condemns as being too variable, and recommends the following instead:.... | |
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