Hydrostatical and Pneumatical LecturesJ. Nourse, in the Strand, and sold, 1775 - 288 ページ |
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abfolute weight afcend againſt alfo almoſt alſo altitude atmoſphere barrel becauſe body capillary caufe cauſe column of water common air compreffed conclufion condenfed confequently confiderable contiguous defcend defcribed denfity difference diminiſhed diſtance eafily endeavours equal bulk exhauſted experiment expreffed faid fame fcale fecond feemed feen feveral fhall fhew fhould fide filver fince fiphon firft firſt fluid fmall folid fome force fpecifick gravity fpring ftandard fuch fufficient fufpended fuftain fuppofe furface geometrical progreffion glafs glaſs greater heat heavier immerfed inches increaſed itſelf Lect leffer lefs lighter liquor magnitude meaſure mercury moſt muft muſt obferved orifice perpendicular phænomena philofophers plane plate polished plates preffed preffure produced propofed proportion pulfes pump purpoſe quantity of air quickfilver raiſed rarefaction rarefied reafon receiver reft reprefented rife ſeem ſhall ſmall ſpace ſpirit thefe themſelves theſe thofe thoſe Torricellian tube underſtand upper furface uſe vacuo veffel whofe
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245 ページ - ... towards the earth, and in their fall meeting with other aqueous particles, they incorporate together and form little drops of rain. But the mercury's being at one time lower than at another, is the effect of two contrary winds blowing from the place where the barometer...
245 ページ - A fecondcaufe is the uncertain exhalation and precipitation of the vapours lodging in the air, whereby it comes to be at one time much more crouded than at another, and confequently heavier ; but this latter in a great meafure depends upon the former.
250 ページ - Eflex, rifes and fwells by the meeting of the two contrary tides of flood, whereof the one comes from the SW along the channel of England, and the other from the north, and on the contrary...
247 ページ - I conceive) it feldom freezes but when the winds come out of the northern and north-eaftern quarters, or at leaft unlefs thofe winds blow at no great diftance off ; for the northern parts of Germany, Denmark, Sweden, Norway, and all that tract from whence north-eaftern winds come...
244 ページ - That upon very great winds, though they be not accompanied with rain, the mercury sinks lowest of all, with relation to the point of the compass the wind blows upon.
245 ページ - ... that they defcend towards the earth, and in their fall, meeting with other aqueous particles, they incorporate together and form little drops of rain.
247 ページ - ... preflure thereof : and the great agitation of its particles is the reafon why the vapours are diffipated, and do not condenfe into drops fo as to form rain, otherwife the natural confequence of the air's rarefaction.
249 ページ - ... height of the mercury; for in the places above named there is always an eafy gale of wind blowing nearly upon the fame point, viz. ENE at Barbadoes, and ESE at St. Helena, fo that there being no contrary currents of the air to exhauft or accumulate it, the atmofphere continues much in the fame...
249 ページ - But those that shall consider how, when once an impetus is given to a fluid body, it is capable of mounting above its level, and checking others that have a contrary tendency to...
248 ページ - ... needs caufe a defcent of the upper parts of the atmofphere, to reduce the cavity made by this contraction to an equilibrium. 6. After great ftorms, when the mercury has been very low, it generally rifes again very faft.