Century Dictionary and Cyclopedia
- n. The glass tube, hermetically sealed at the top, within which the mercurial column of a barometer is contained. The tube is filled with mercury when inverted, and many methods have been devised to accomplish this satisfactorily. By Fortin's method, the mercury is introduced little by little, and boiled within the tube by gently heating it so as to expel all gas or vapor. In George's method the mercury is not boiled but is stirred, and the air-bubbles are removed with a feather. In Bogen's method the mercury is made to flow from end to end until all bubbles escape: the open end is then attached to an air-pump and the last traces of air are pumped out. In Sprung's automatic method the tube is placed open end up and warmed; the mercury is placed in a separate vessel over a lamp and is continuously distilled over, through an intermediate tube, into the tube, where it collects under a perfect vacuum until the tube is full: a clean tube, a perfect vacuum, and distilled mercury are thus obtained by one operation.
- n. An area in which the current barometric pressure is decidedly above the normal value for that place and date.
- n. An area in which the current barometric pressure is decidedly below the normal value for that place and date.
“At the same moment the professor manipulated another valve, intently watching the barometer-tube meanwhile; and presently it became apparent that the descending movement had ceased, and that the _Flying Fish_ was hanging suspended in mid-air, about a thousand feet below the vast cloud-veil that now obscured the heavens.”
“All at once the blood dropped out of her cheeks as the mercury drops from a broken barometer-tube, and she melted away from her seat like an image of snow; a slung-shot could not have brought her down better.”
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