Memoirs for the ingenious. : Containing several curious observations in philosophy, mathematicks, physick, philology, and other arts and sciences. In miscellaneous letters. / By J. De La Crose, E. A. P. January, 1693. To be continued monthly. Vol. I.

Date:: 1693

Credit: Memoirs for the ingenious. : Containing several curious observations in philosophy, mathematicks, physick, philology, and other arts and sciences. In miscellaneous letters. / By J. De La Crose, E. A. P. January, 1693. To be continued monthly. Vol. I. Source: Wellcome Collection.

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$January; 169). fervatory at Paris, in an open place, and having begun his Obferva- rions on the iftofjfw>e ,e88, he continued them to the laft ofi»£ cember 1690, when a ficknefs of his interrupted the corn fe of tliae eX¥omeafare the Rain-Water, he put, at one of the corners of the bottom cf the Ciftern fitted to receive the Ram, a Tap bywhich -sfoon as it began to rain, the water fell in a Cubical yeikl3 inches long, broad and high, which confequently contain d 27 Cuke Ses of water. Thefe 27 inches ot water lying level upon the ba- K the Ciftern, were found by calculation and experience, to be aifed 'of a fine above it, and therefore as often as this frnall Vel- fe was taken away, it was a fign that it had rain’d \ of a line high 5 and that the water ihould have no time to evaporate, it was meafu’ red asfoon as it was fall*n,and the Ciftern fully evacuated. To take notice of the evaporation he filled up the odrerC^em robalf a foot from its uppermoft brink,left the Veffel sang too full, he citation of the wind (hould fpill the water, Every may the di- ftance from the uppermoft brink of die Ciftern to the fuperficies of thewater was meafurUby the means of two rules, whereof one,which was pierc’d through the middle, lay horizontally and level upon the brink of the Ciftern, and the other, which was dwided mw inches and lines, enter’d vertically into the hole of the firft. Now to know how much Water had. been evaporated within a certain time, as a month, he added to the quantity, mark’d by mes upon the Rule, the quantity of the Rain-water that was M’n during that month, fuppofing it to be known, as having obfewd 0. the means of the other Ciftern. _ The refult of his Obfetvattons are as follow. Anno M DC LXXXVIII. 1 June July Auguit September October November December Rain. 2 Inch. \ Inch, o inch, i Inch, i Inch, i Inch. 9 Lin. \ 9 Lin. 3 Lin 1 7 Lin. 8 Lin. I 7 Lin % i Inch. 9 Lin. \ June July Auguft September October November December Evaporation. $ Inch. io Linesi 5 Inch. 4 Lin- 4 loch, 4 Lin. 3 Inch. 2. Lin. i Inch. S Lin. o Inch. 8 Lin. o Inch, 8 Lin. Sum of the l {1 ]nch. 6 Lin. \ b2 ^nc^’ * kin: Evaporation A ^ «$

Memoirs for the ingenious. : Containing several curious observations in philosophy, mathematicks, physick, philology, and other arts and sciences. In miscellaneous letters. / By J. De La Crose, E. A. P. January, 1693. To be continued monthly. Vol. I.

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