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- spectrophotometer by Grace GoodwinInstrument for measuring and comparing the intensities of common spectral lines in the spectra of...
- Potentiometer by Webster's(n.) An instrument for measuring or comparing electrial potentials or electro-motive forces.
- Photometer by Webster's(n.) An instrument for measuring the intensity of light, or, more especially, for comparing the...
- Sensitometer by Webster's(n.) An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc.,...
- Bolometer by Webster's(n.) An instrument for measuring minute quantities of radiant heat, especially in different parts...