Difference between revisions of ".Mzc2.NzUwMA"
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of heat, may assist us in discovering those which are | of heat, may assist us in discovering those which are | ||
produced upon our bodies from the same cause. | produced upon our bodies from the same cause. | ||
104. The point 0 of my hygrometer, as I have | 104. The point 0 of my hygrometer, as I have | ||
| − | before observed (44), is that of the extreme | + | before observed (44), is that of the extreme humidity |
| − | + | produced by melting ice. It was therefore of | |
some importance to know what difference there | some importance to know what difference there | ||
would be in this point, when the hygrometer should | would be in this point, when the hygrometer should | ||
| Line 12: | Line 13: | ||
firn inquiries. | firn inquiries. | ||
| − | 105. The moment I took one of my | + | 105. The moment I took one of my hygrometers |
| − | + | out of melting ice, I plunged it into water at | |
the heat of 4 degrees of the thermometer that I | the heat of 4 degrees of the thermometer that I | ||
| − | have called common. It fell suddenly four of its | + | have called common. It fell suddenly four of its degrees |
| − | + | below the thread which marked its height in | |
the melting ice, but immediately rose again, and in | the melting ice, but immediately rose again, and in | ||
four minutes reached 8 degrees and a half above the | four minutes reached 8 degrees and a half above the | ||
| Line 22: | Line 23: | ||
the dilation of the mercury (48), there will remain | the dilation of the mercury (48), there will remain | ||
14. Consequently the water warmed at 45 degrees | 14. Consequently the water warmed at 45 degrees | ||
| − | of the common thermometer, really made the | + | of the common thermometer, really made the hygrometer |
| − | + | sink 14 degrees be low 0. | |
106. Half an hour after this, the water being at | 106. Half an hour after this, the water being at | ||
38 degrees, I found the hygrometer no higher than | 38 degrees, I found the hygrometer no higher than | ||
6 1/2, that is to say 61/2 - 38/2 =-12 1/2. Consequently | 6 1/2, that is to say 61/2 - 38/2 =-12 1/2. Consequently | ||
| − | the true point of humidity indicated by the | + | the true point of humidity indicated by the hygrometer |
| − | + | was 12 1/2 below 0. Lastly, the heat of the | |
water being reduced to 28 degrees the hygrometer | water being reduced to 28 degrees the hygrometer | ||
was at 3 - 28/2 = -11. I was then obliged to put | was at 3 - 28/2 = -11. I was then obliged to put | ||
an end to the experiment, which I have not been able | an end to the experiment, which I have not been able | ||
to take up again since, for want of leisure. But | to take up again since, for want of leisure. But | ||
| − | what | + | |
| + | [[catchword]] what [[/catchword]] | ||
Latest revision as of 09:02, 20 October 2018
[ 53 ]
of heat, may assist us in discovering those which are produced upon our bodies from the same cause.
104. The point 0 of my hygrometer, as I have before observed (44), is that of the extreme humidity produced by melting ice. It was therefore of some importance to know what difference there would be in this point, when the hygrometer should be plunged into warmer water This I endeavoured to find out ; and the following is the result of my firn inquiries.
105. The moment I took one of my hygrometers out of melting ice, I plunged it into water at the heat of 4 degrees of the thermometer that I have called common. It fell suddenly four of its degrees below the thread which marked its height in the melting ice, but immediately rose again, and in four minutes reached 8 degrees and a half above the same thread. Deducting 22 1/2 from the height for the dilation of the mercury (48), there will remain 14. Consequently the water warmed at 45 degrees of the common thermometer, really made the hygrometer sink 14 degrees be low 0.
106. Half an hour after this, the water being at 38 degrees, I found the hygrometer no higher than 6 1/2, that is to say 61/2 - 38/2 =-12 1/2. Consequently the true point of humidity indicated by the hygrometer was 12 1/2 below 0. Lastly, the heat of the water being reduced to 28 degrees the hygrometer was at 3 - 28/2 = -11. I was then obliged to put an end to the experiment, which I have not been able to take up again since, for want of leisure. But
catchword what /catchword
