Worst, Edward F. (Edward Francis), 1866-1949, Barber, Harriette, [from old catalog] joint author, Seymour, Marian, [from old catalog] joint author · Chicago, A. W. Mumford and company · leaf 267
tion of the hygrometer is simple, and through itsuse the pupils may collect data from which most interestingresults regarding atmospheric moisture may be calculated. To make a hygrometer, proceed thus: Select two mercu-rial thermom.eters which under similar conditions read thesame. Fasten these,… … FIGURE XXVII. with clean, thin muslin and allow a bundle of twelve orfifteen threads to reach from the muslin envelope down tothe bottom of the bottle. Fill the bottle with clean waterand allow the threads to enter through a hole in the cork. 264 The water evaporating^ from the muslin cools the…
Manual training · Paper work · Basket making
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