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The museum's archive contained a dusty Hefner lamp that had been used for calibrating photometers in the early twentieth century.
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The museum's archive contained a dusty Hefner lamp that had been used for calibrating photometers in the early twentieth century.
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Related words
Hefner lamp
Noun
Japanese Meaning
フォトメトリー（光度計測）に用いられる炎ランプで、アミルアセテートを燃焼させ、ヨーロッパの一部地域において光度の標準として使用された。
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