… Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, …
Explanatory notes
… Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, … of the acid in accumulators) are enclosed in a glass syringe. Other types are combined with a thermometer. Most … apparatus which are not floating instruments, for example, butyrometers (for determining the fatty content of butter), …