… and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or …
Explanatory notes
… and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or … . These instruments are used to measure the wave‑lengths of emission and absorption spectra. They consist … for gas detection in mines or tunnels, for detecting leaks in mains, etc. (11) Apparatus for dust analysis in …