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" 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 236
by Franklin Institute (Philadelphia, Pa.) - 1866
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Annual Register, Volume 110

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,...
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Orr's Circle of the Sciences: Practical chemistry (1856)

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...
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Chemical News and Journal of Industrial Science, Volumes 13-14

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...
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The Chemical News and Journal of Physical Science, Volumes 13-24

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...
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The Analysis, Technical Valuation, Purification, and Use of Coal Gas

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...
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Gas manipulation. enlarged by W.T. Sugg

Henry Banister (writer on gas.) - 1867 - 210 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,...
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The Manchester record

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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Quarterly Journal of Science: 1868, Volume 5

1868 - 676 pages
...process of photometry the standard used is a candle, defined by Act of Parliament as a "sperm candle of six to the pound, burning at the rate of 120 grains per hour." This is the standard from which estimates of the value of illuminating gas are deduced, hence the terms...
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Monthly Journal of Science, and Annals of Biology, Astronomy ..., Volume 5

James Samuelson, William Crookes - 1868 - 664 pages
...process of photometry the standard used is a candle, denned by Act of Parliament as a "sperm candle of six to the pound, burning at the rate of 120 grains per hour." This is the standard from which estimates of the value of illuminating gas are deduced, hence the terms...
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The Annual Register

Edmund Burke - 1869 - 672 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 such a rude test could hardly be hut, what it generally was, fallacious ; for candles,...
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