 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...  Quarterly Journal of Science: 1868 - Sayfa 3451868Tam görünüm - Bu kitap hakkında
 | Edmund Burke - 1869 - 652 sayfa
...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,... | |
 | Institution of Civil Engineers (Great Britain) - 1876 - 374 sayfa
...lamp or candle. In England, since the year 1852, the parliamentary standard of comparison has been a sperm candle, of six to the pound, burning at the rate of 120 grains per hour. As the result of an elaborate series of experiments conducted by Professors Graham, Brande, JT Cooper,... | |
 | Royal Society (Great Britain) - 1869 - 674 sayfa
...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...account of the difficulties which stand in the way of Luminous Intensity of Light. 361 obtaining uniform results with the Act-of-Parliament candle. A... | |
 | William Somerville Orr - 1856 - 596 sayfa
...the standard which is specified in most of the Acts of Parliament relating to the subject, is a wax candle of six to the pound, burning at the rate of 120 grains per hour. In general, however, it is found that there are more irregularities with the combustion of wax than... | |
 | 1866 - 638 sayfa
...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... | |
 | Henry Banister (writer on gas.) - 1867 - 212 sayfa
...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 - 358 sayfa
...uniform source of light. In the ordinary process of photometry the standard used is a candle, denned by Act of Parliament as a " sperm candle of six to...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 sayfa
...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 sayfa
...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... | |
 | John Henry Pepper - 1869 - 722 sayfa
...being respectively i J ft. and 3 ft. — 1 1 x \1 = '44 T 3 X 3 = 9' Quotient, 16. • In the practice of photometry the standard used is a candle defined...burning at the rate of 120 grains per hour." .This standard would be a very simple one if every candle could be made alike, but it unfortunately happens... | |
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