 It is therefore evident that the great thing to be aimed at is an absolutely uniform source of light. In the ordinary 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...  Proceedings of the Royal Society of London - Page 358by Royal Society (Great Britain) - 1869Full view - About this book
 | Edmund Burke - 1869 - 652 pages
...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,... | |
 | 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 - 638 pages
...just one-seventh greater than that of wax. At present, the standard flame in this country is a sperm of six to the pound, burning at the rate of 120 grains per hour. But for some time past this standard has also become uncertain — first, because there has been great... | |
 | 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,... | |
 | 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...stand in the way of obtaining uniform results with the Act of Parliament candle. A true sperm candle is made from a mixture of refined sperm with a small... | |
 | 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...stand in the way of obtaining uniform results with the Act of Parliament candle. A true sperm candle is made from a mixture of refined sperm with a small... | |
 | 1868 - 358 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...12-candle gas," " 14-candle gas," &c. In his work on Oat Manipulation, Mr. Sugg gives a very good account of the difficulties which stand in the way of... | |
 | 1868 - 638 pages
...burning at the rate of 120 grains per hour.r^i This is the standard from which estimates of the v^c of illuminating gas are deduced, hence the terms "...stand in the way of obtaining uniform results with the Ad of Parliament ( CHEMICAL NEWS, I July 17, 1868. candle. A true sperm candle is made from a mixture... | |
 | 1869 - 204 pages
...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:. A... | |
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