… Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, …
Explanatory notes
… glass tube . These include household thermometers (room, window thermometers, etc.), floating thermometers … glass disc, coated with an emulsion of varying density, is rotated so as to vary the intensity of light from the hot body. The number of degrees of rotation of the disc necessary to match the brightness in …