Hefner lamp (redirect from Hefnerkerze)
The Hefner lamp, or in German Hefnerkerze, is a flame lamp used in photometry that burns amyl acetate. The lamp was invented by Friedrich von Hefner-Alteneck...
2 KB (232 words) - 02:48, 10 August 2024
rate of 120 grains per hour. Germany, Austria, and Scandinavia used the Hefnerkerze, a unit based on the output of a Hefner lamp. In 1881, Jules Violle proposed...
9 KB (1,014 words) - 10:42, 9 October 2024
rate of 120 grains per hour. Germany, Austria and Scandinavia used the Hefnerkerze, a unit based on the output of a Hefner lamp. A better standard for luminous...
17 KB (2,176 words) - 20:06, 28 October 2024
A Hefner lamp (German: Hefnerkerze)...
16 KB (1,677 words) - 05:01, 20 October 2024
horsepower, a measure of power (1 hk = 0.9863 hp (UK, US) = 0.7355 kW) Hefnerkerze, an old photometric unit of luminous intensity Hexokinase, an enzyme...
2 KB (274 words) - 15:44, 13 November 2024
Scandinavia from 1890 to 1942. The measure was called the Hefnerkerze (HK). The Hefnerkerze was superseded in the 1940s by the modern SI unit, the candela...
4 KB (202 words) - 12:25, 27 September 2023