Difference between revisions of ".Mzc2.NzQ4OA"
(Created page with "[ 47 ] sirable circumstance, that the ivory pipe of the hy- grometer should be the thin ness possible; in order that it might be more readily affected. This I had fore- seen...") |
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sides would be thinner. However, this might be tried. | sides would be thinner. However, this might be tried. | ||
In the mean time, I fancy that, for observations in | In the mean time, I fancy that, for observations in | ||
| − | + | which it is absolutely necessary that the instrument | |
should easily be affected, lesser hygrometers might | should easily be affected, lesser hygrometers might | ||
| − | be made, | + | be made, whose tubes containing a less quantity of |
mercury, would resist the action of it, though with | mercury, would resist the action of it, though with | ||
a less degree of thickness (Perhaps it would not | a less degree of thickness (Perhaps it would not | ||
be impossible to use tubes made of some very thin | be impossible to use tubes made of some very thin | ||
| − | quills.) I cannot yet ascertain whether these little | + | quills.) I cannot yet ascertain whether these little hy- |
grometers could be graduated by themselves, or whe- | grometers could be graduated by themselves, or whe- | ||
ther they must be compared with those of which | ther they must be compared with those of which | ||
I have given the dimensions; this we shall learn | I have given the dimensions; this we shall learn | ||
from experience. | from experience. | ||
| + | |||
94. The difference there is between the heat and | 94. The difference there is between the heat and | ||
| − | the discrete humor in the power of diffusing itself, | + | the discrete humor in the power of diffusing itself, oc- |
casions in another respect a considerable difference in the | casions in another respect a considerable difference in the | ||
| − | + | goings of the thermometer and hygrometer. The | |
heat is brought into a state of equilibrium much | heat is brought into a state of equilibrium much | ||
sooner and with much greater certainty than the | sooner and with much greater certainty than the | ||
humor. Two thermometers accurately constructed | humor. Two thermometers accurately constructed | ||
and fixed near each other, in a place where the heat | and fixed near each other, in a place where the heat | ||
| − | does not change very | + | does not change very suddenly, always agree to- |
gether This is not the cafe with two hygrometers: | gether This is not the cafe with two hygrometers: | ||
they seldom agree, that is, they seldom preserve the | they seldom agree, that is, they seldom preserve the | ||
same conformity to each other, when there is the | same conformity to each other, when there is the | ||
least variation in the humor: at some times their | least variation in the humor: at some times their | ||
| − | difference increases, it | + | difference increases, it others it diminishes; this can |
only | only | ||
Revision as of 15:09, 3 December 2017
[ 47 ] sirable circumstance, that the ivory pipe of the hy- grometer should be the thin ness possible; in order that it might be more readily affected. This I had fore- seen, before I had learnt it from experience ; but I was afraid of its being attended with still greater in- conveniences than that it was intended to remedy ; from the action of the mercury against pipes whose sides would be thinner. However, this might be tried. In the mean time, I fancy that, for observations in which it is absolutely necessary that the instrument should easily be affected, lesser hygrometers might be made, whose tubes containing a less quantity of mercury, would resist the action of it, though with a less degree of thickness (Perhaps it would not be impossible to use tubes made of some very thin quills.) I cannot yet ascertain whether these little hy- grometers could be graduated by themselves, or whe- ther they must be compared with those of which I have given the dimensions; this we shall learn from experience.
94. The difference there is between the heat and the discrete humor in the power of diffusing itself, oc- casions in another respect a considerable difference in the goings of the thermometer and hygrometer. The heat is brought into a state of equilibrium much sooner and with much greater certainty than the humor. Two thermometers accurately constructed and fixed near each other, in a place where the heat does not change very suddenly, always agree to- gether This is not the cafe with two hygrometers: they seldom agree, that is, they seldom preserve the same conformity to each other, when there is the least variation in the humor: at some times their difference increases, it others it diminishes; this can only
