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The Hefner lamp provided the German, Austrian, and
Scandinavian standard for luminosity during the late nineteenth and early twentieth centuries. The unit of light intensity was defined as that produced by the lamp burning
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unit of the
Hefnerkerze (HK). The lamp was specified as having a 40 mm flame height and an 8 mm diameter wick.
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with a 40 mm flame height. The light unit was adopted by the German gas industry in 1890 and known as the
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in 1884 and he proposed its use as a standard flame for photometric purposes with a
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Germany moved to using the new candle (NC) from 1 July 1942 and the
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150:A Dictionary of Weights, Measures, and Units
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146:Hefner candle, Hefner unit, Hefnerkerze
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86:1 Hefnerkerze is about 0.920 candelas.
102:List of obsolete units of measurement
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152:, Oxford University Press 2002,
121:"Hefner unit, or Hefner candle"
169:"Lichtstärke und Lichteinheit"
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1:
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53:Friedrich von Hefner-Alteneck
16:Flame lamp used in photometry
203:. You can help Knowledge by
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171:(in German). Archived from
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40:, is a flame lamp used in
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51:The lamp was invented by
23:Hefner lamp or in German
260:History of science stubs
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148:in Donald Fenna (ed)
197:history of science
57:luminous intensity
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82:(cd) from 1948.
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175:on 2008-04-19.
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127:. 30 May 2007
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69:Hefnereinheit
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205:expanding it
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129:. Retrieved
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65:amyl acetate
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46:amyl acetate
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97:Candlepower
73:Hefnerkerze
44:that burns
37:Hefnerkerze
32:Hefner lamp
25:Hefnerkerze
250:Photometry
244:Categories
108:References
42:photometry
125:Sizes.com
255:Lighting
160:, p. 124
91:See also
80:candela
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131:25 Feb
75:(HK).
195:This
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154:ISBN
133:2009
30:The
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
