Difference between revisions of ".Mzc2.NzQ4MA"
(Created page with "[ 43 ] that of the town, I determined to observe at the same time the variations of the humor in the open air for a whole day together. There are doubtless many varieties i...") |
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varieties in this respect; nor indeed shall I determine | varieties in this respect; nor indeed shall I determine | ||
from this observation anything more than the state | from this observation anything more than the state | ||
− | of the open air during one day, and in one | + | of the open air during one day, and in one parti- |
cular foot. | cular foot. | ||
− | 90. I made my observation the 13th of | + | |
+ | 90. I made my observation the 13th of Septem- | ||
ber 1772, in a garden situated to the west of our | ber 1772, in a garden situated to the west of our | ||
lake, and only separated from it by another garden | lake, and only separated from it by another garden | ||
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which had no other frame but aa scale fixt to its tube, | which had no other frame but aa scale fixt to its tube, | ||
and the other was in a frame whose opening at the | and the other was in a frame whose opening at the | ||
− | + | height of the ivory tube was of considerable size. | |
They were four feet and a half above the ground, | They were four feet and a half above the ground, | ||
and at the distance of t foot from each other. A | and at the distance of t foot from each other. A | ||
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the fun Each hygrometer had a thermometer close | the fun Each hygrometer had a thermometer close | ||
to it, the ball of which was not in contact with any | to it, the ball of which was not in contact with any | ||
− | thing. 1 have proved in my work, that it is | + | thing. 1 have proved in my work, that it is ne- |
− | cessary to keep this ball | + | cessary to keep this ball insulated, in order to observe |
the heat of the free air. | the heat of the free air. | ||
91. One of the hygrometers I made use of for | 91. One of the hygrometers I made use of for | ||
this observation, was at 93, and the other at 96 1/2 | this observation, was at 93, and the other at 96 1/2 | ||
in my room the night at before In order to correct | in my room the night at before In order to correct | ||
− | this difference, which I should suppose to be in | + | this difference, which I should suppose to be in pro- |
portion to their height, I would always add about | portion to their height, I would always add about | ||
1/1.to the height of that one which kept itself the | 1/1.to the height of that one which kept itself the |
Revision as of 14:59, 3 December 2017
[ 43 ] that of the town, I determined to observe at the same time the variations of the humor in the open air for a whole day together. There are doubtless many varieties in this respect; nor indeed shall I determine from this observation anything more than the state of the open air during one day, and in one parti- cular foot.
90. I made my observation the 13th of Septem- ber 1772, in a garden situated to the west of our lake, and only separated from it by another garden and some buildings. There I hung up a couple of hygrometers which I kept perfectly insulated, one of which had no other frame but aa scale fixt to its tube, and the other was in a frame whose opening at the height of the ivory tube was of considerable size. They were four feet and a half above the ground, and at the distance of t foot from each other. A piece of pasteboard about 12 inches in breadth, placed at a foot's distance from the hygrometer which was not mounted, was intended to shelter it from the fun Each hygrometer had a thermometer close to it, the ball of which was not in contact with any thing. 1 have proved in my work, that it is ne- cessary to keep this ball insulated, in order to observe the heat of the free air. 91. One of the hygrometers I made use of for this observation, was at 93, and the other at 96 1/2 in my room the night at before In order to correct this difference, which I should suppose to be in pro- portion to their height, I would always add about 1/1.to the height of that one which kept itself the lowest, that there might be no difference between them, but such as should be produced by the dif- G 2 ference