 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 359by Royal Society (Great Britain) - 1869Full view - About this book
 | Sir Richard Glazebrook - 1894 - 236 pages
...satisfactory one, is the illuminating power of the standard candle. Standard candles are sperm candles, six to the pound, burning at the rate of 120 grains per hour. Other sources of light such as a gas flame are compared with one or more such standard candles, and... | |
 | Sir Richard Tetley Glazebrook - 1894 - 482 pages
...satisfactory one, is the illuminating power of the standard candle. Standard candles are sperm candles, six to the pound, burning at the rate of 120 grains per hour. Other sources of light such as a gas flame are compared with one or more such standard candles, and... | |
 | Sir Richard Glazebrook - 1894 - 292 pages
...satisfactory one, is the illuminating power of the standard candle. Standard candles are sperm candles, six to the pound, burning at the rate of 120 grains per hour. Other sources of light such as a gas flame are compared with one or more such LIGHT. [CH. I standard... | |
 | 1896 - 714 pages
...gas engineers, and which is also the statutory standard of illuminating value, is a sperm candle (6 to the pound), burning at the rate of 120 grains per hour. The consumption of sperm is accelerated or retarded by varying conditions. A delicate balance is used... | |
 | Sir Richard Glazebrook - 1902 - 236 pages
...satisfactory one, is the illuminating power of the standard candle. Standard candles are sperm candles, six to the pound, burning at the rate of 120 grains per hour. Other sources of light such as a gas flame are compared with one or more such LIGHT. [CH. I standard... | |
 | American Gas Institute - 1907 - 1050 pages
...a flame giving an amount of light twenty times as great as that given by the standard sperm candle of six to the pound burning at the rate of 120 grains per hour. Different forms of burners are used in different localities as the standards for the purpose of determining... | |
 | Sir Richard Glazebrook - 1914 - 500 pages
...satisfactory one, is the illuminating power of the standard candle. Standard candles are sperm candles, six to the pound, burning at the rate of 120 grains per hoar. Other sources of light •uch as a gas flame are compared with one or more such LIGHT. [CH. I... | |
 | 1869 - 526 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, however, is found to be very variable, and many observers have altogether condemned the employment... | |
 | 1869 - 1022 pages
...on. In testing the quality of gas, the standard candle defined by Act of Parliament is a sperm candle of six to the pound, burning at the rate of 120 grains per hour. From such a standard we get the terms " 12-candle gas," " 14- can die gas," &c. Mr. Sugg, in his 'Gas... | |
 | 1869 - 602 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, however, is found to be very variable, and many observers have altogether condemned the employment... | |
| |
