Hefner lamp
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Hefner lamp in chemistry is a flame lamp that burns amyl acetate.
The lamp was invented by Friedrich von Hefner-Altenec in 1884 and he proposed its use as a standard flame for photometric purposes.
The Hefner lamp provided the German 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 amyl acetate with a 40 mm flame height.
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