Section 261 in Rules under the United Provinces Excise Act, 1910
261. Instructions for the care of thermometers.
- Glass hydrometers when not in use should remain in a position such that the mercury in the bulb may not come in contract with the sealing wax which in most patterns the bulb is closed.Brass hydrometer, of which some are still in use, are exceedingly delicate contract with hard surfaces must be avoided; even unnecessary friction in adjusting the weights will reduce the weight of the instrument and cause it to show less than the true alcoholic strength. Great care must, therefore, be taken to avoid denting or scratching the hydrometer or its weights. A soft pad or cloth should be used for placing them on during use. Before returning them to their cases they should be well washed in clean water, and carefully dried with a selvyt or similar duster which may be purchased locally. Brass hydrometers should be frequently tested against a glass hydrometer and variation, if any, noted and allowed for. For these tests samples of spirit of different strength requiring different weights should be used.When not in use, all hydrometers and thermometers should be kept in their cases.
