Handy Book of MeteorologyWilliam Blackwood, 1868 - 371 páginas |
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Página 16
... scale , is more than counterbalanced by a serious objection . The space in the tube above the water is not a true vacuum , but is filled with aqueous vapour , which presses on the water with a force varying with the temperature . If the ...
... scale , is more than counterbalanced by a serious objection . The space in the tube above the water is not a true vacuum , but is filled with aqueous vapour , which presses on the water with a force varying with the temperature . If the ...
Página 17
... scale , extending from the surface of the mercury in the cistern to the top of the tube , to make it complete . Cistern barometers are subject to two sorts of error , the one arising from capillarity , and the other from changes of ...
... scale , extending from the surface of the mercury in the cistern to the top of the tube , to make it complete . Cistern barometers are subject to two sorts of error , the one arising from capillarity , and the other from changes of ...
Página 18
... scale are sometimes too high and sometimes too low . The simplest and rudest way of compensating for this error is to ascer- tain ( 1 ) the neutral point of the instrument — that is , the height at which it stands when the zero of the scale ...
... scale are sometimes too high and sometimes too low . The simplest and rudest way of compensating for this error is to ascer- tain ( 1 ) the neutral point of the instrument — that is , the height at which it stands when the zero of the scale ...
Página 19
... scale , G , of the instrument has been graduated . Hence , then , with every observation , the screw , P , must be ... scale . The error of capacity is obviated by making the inches of the scale not true inches , but just so much less as ...
... scale , G , of the instrument has been graduated . Hence , then , with every observation , the screw , P , must be ... scale . The error of capacity is obviated by making the inches of the scale not true inches , but just so much less as ...
Página 21
... scale , and hence in observing it is only necessary to set the surface of the mercury in the lower limb to the neutral point of the scale , and the pressure is seen at once from the upper limb . Since in siphon barometers the capillary ...
... scale , and hence in observing it is only necessary to set the surface of the mercury in the lower limb to the neutral point of the scale , and the pressure is seen at once from the upper limb . Since in siphon barometers the capillary ...
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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