Handy Book of MeteorologyWilliam Blackwood, 1868 - 371 páginas |
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Página 19
... mercury in the cistern at T , is enclosed in a brass tube , which extends continuously from the brass box , B , to the top of the instrument . This brass tube is made with two opposite slits for the purpose of showing the height of the ...
... mercury in the cistern at T , is enclosed in a brass tube , which extends continuously from the brass box , B , to the top of the instrument . This brass tube is made with two opposite slits for the purpose of showing the height of the ...
Página 20
... mercury , by fixing the ivory piston , F , which acts as a stopper to the cistern on being screwed up tight ; then by the screw , P , raise the mercurial column to about half an inch from the top of the tube ; and having slowly inverted ...
... mercury , by fixing the ivory piston , F , which acts as a stopper to the cistern on being screwed up tight ; then by the screw , P , raise the mercurial column to about half an inch from the top of the tube ; and having slowly inverted ...
Página 21
... mercury , when struck against the top of the tube , by gently inclining the barometer , will show when the whole of the air has been got rid of . On hanging up the barometer , care must be taken to lower the mercury in the tube by ...
... mercury , when struck against the top of the tube , by gently inclining the barometer , will show when the whole of the air has been got rid of . On hanging up the barometer , care must be taken to lower the mercury in the tube by ...
Página 22
... mercury gets foul , and , adhering to the tube , impedes the smooth working of the instrument . In narrow tubes this becomes a very serious objection . 40. The common Wheel Barometer , the popular form of the weather - glass , is a ...
... mercury gets foul , and , adhering to the tube , impedes the smooth working of the instrument . In narrow tubes this becomes a very serious objection . 40. The common Wheel Barometer , the popular form of the weather - glass , is a ...
Página 23
... mercury in the cistern . This stalk terminates a little below the upper level of the mercury , a , and its upper end is therefore ex- posed to no more downward pressure than that of the mercury above it ; consequently there is an excess ...
... mercury in the cistern . This stalk terminates a little below the upper level of the mercury , a , and its upper end is therefore ex- posed to no more downward pressure than that of the mercury above it ; consequently there is an excess ...
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Palavras e frases frequentes
America antisolar point ascending Asia Atlantic atmospheric pressure average barometer blow Britain calm causes centre charts cirrus cirrus cloud cistern climate cloud coast cold colder column condensed continent Crown 8vo daily dew-point diminished direction dry air earth earth's surface east Edition electricity equator equatorial current Europe evaporation falls Fcap feet flow globe greater heat height hemisphere Hence high pressure higher hour humidity hygrometer Iceland inch of mercury inches increase Indian Ocean isobarometric lines January John Herschel July latitudes low pressure lower Mauritius maximum mean temperature mercury Meteorological meter miles moisture monsoon months northern northern hemisphere Norway observations occur ocean Orkney perature Plate polar current polarisation prevail Professor rain rainfall regions rises round Scotland season snow soil St Petersburg storm summer temperature terrestrial radiation thermometers tion tropics tube upper currents vapour vols weather wind winter Yakutsk