 | Ira Osborn Baker - 1893 - 430 páginas
...of metal and glass, and not easily injured ; but when hung up, a sudden jolt might send a bubble of air into the vacuum at the upper end of the tube, and the instrument would be useless until refilled." * ART. 2. ANEROID BAROMETERS. 340. The aneroid barometer consists of a cylindrical metallic... | |
 | United States. War Department - 1871 - 484 páginas
...hung up. a sudden- jolt might send a bubble of air into the vacuum at the upper end of the tube, aud the instrument would be useless until repaired. If...slightest degree, the zero of the instrument. Everything use.] in the operation must be clean aud dry 5 avoid blowing upon any of the parts, as the moisture... | |
 | United States. Army. Signal Corps - 1872 - 366 páginas
...of metal and glass—and not easily iujured ; but when hung up, a sudden jolt might send a bubble of air into the vacuum at the upper end of the tube,...and the instrument would be useless until repaired. Observers must never swing the barometer or endeavor to force the mercury against the top of the tube... | |
 | United States. War Department - 1873 - 1262 páginas
...of metal and glass — and not easily injured, bnt when hung up a sudden jolt might send a bubble of air into the vacuum at the upper end of the tube,...and the instrument would be useless until repaired. Observers must never siring the barometer or endeavor to force the mercury against the top of the tube... | |
 | United States signal office - 1873 - 330 páginas
...and glass— and not easily injured ; but when hung up, a sudden jolt might send a bubble of air iuto the vacuum at the upper end of the tube, and the instrument would be useless until repaired. Observers must never swing the barometer or endeavor to force the mercury against the top of the tube... | |
 | United States. War Department - 1879 - 1068 páginas
...top of the tube without first screwing up tho large adjusting screw at the base of the cistern. 40. If the cistern should become dirty, it can be cleaned with safety and without changing the zero of the instrument. Everything used in the operation must be clean and dry. Blowing upon any... | |
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... while screwed up, gently inverted and hung up, when it can be unscrewed. While it has its cistern uppermost, the tube is full — is one solid mass of metal and glass — and not easily injured... 
