Hefner lamp

短语

词形变化

Hefner lamps 复数 Hefner lamps

释义与例句

n.
  1. 1.

    A flame lamp used in photometry that burns amyl acetate and has been used as a standard for measuring luminosity in parts of Europe.

词源

Invented by Friedrich von Hefner-Alteneck in 1884.

来源：wiktionary