
From
Scientific American, Volume XII, Issue 1, published September 13,
1856.
Scientific Ladies - Experiments with Condensed Gases.
Some have not only entertained, but expressed the mean idea, that women
do not possess the strength of mind necessary for scientific
investigation. Owing to the nature of woman’s duties, few of them have
had the leisure or the opportunities to pursue science experimentally,
but those of them who have had the taste and the opportunity to do so,
have shown as much power and ability to investigate and observe
correctly as men.
We have Miss Mitchell, who has been awarded the King of Denmark’s prize
medal for her discoveries in astronomy; and there is Mrs. Somerville, of
London, whose work on physical geography is one of the finest
contributions to physical science ever published. So highly gifted is
this lady, and so profoundly versed in the science, that the late Prof.
Caldwell, of Louisville, who had an opportunity of conversing with her,
and also seeing her perform some experiments, declared “she was deeply
acquainted with almost every branch of physical science.” Other cases
might be mentioned, but these are sufficient for our purpose.
Our constant readers will remember that several articles from different
persons appeared in the last volume of the SCIENTIFIC
AMERICAN, relating to solar heat at the surface of the earth. The
question was introduced by Wm. Partridge, of Binghamton, who took the
position, that density of the atmosphere, and not the angularity of the
sun’s rays, was the principal reason why it was warmer in valleys than
on the tops of mountains. His views were opposed by other
correspondents, but none of them supported their opinions with practical
experiments to decide the question; this we are happy to say has been
done by a lady.
A paper was read before the late meeting of the Scientific
Association,
by Prof. Henry for Mrs. Eunice Foot (sic), detailing her experiments
to determine the effects of the sun’s rays on different gases. These
were made with an air pump and two glass receivers of the same size—four
inches in diameter, and thirty in length. The air was exhausted from one
and condensed in the other, and they were both placed in the sun light,
side by side, with a thermometer in each. In a short period of time, the
temperature in the receiver containing the condensed air, rose thirty
degrees higher than the other ; thus proving conclusively that the
greater density of air on low levels is at least one cause of greater
heat in valleys than on mountains. Experiments were also tried with
moist air, and its temperature was elevated above dry air. Hydrogen gas
was placed in one receiver and oxygen in the other, when the temperature
of the former rose to 104°, but the latter to 106° Fah.; while, in
carbonic acid—a more dense gas than either—it rose to 126°.
It is believed and taught by geologists that during the period preceding
the carboniferous era,—when the coal bed materials were forming—that the
atmosphere of the earth contained immense quantities of carbonic acid,
and that there was a very elevated temperature of atmosphere in
existence, in comparison with that of the present day. Those who believe
that this earth was once a fiery ball, attribute this ancient great
atmospheric heat to the elevated temperature of the earth; but Mrs.
Foot’s experiments attribute it to a more rational cause, and leave the
Plutonists but a small foundation to stand upon for their theory.
The columns of the SCIENTIFIC AMERICAN have
been oftentimes graced with articles on scientific subjects, by ladies,
which would do honor to men of the highest scientific reputation; and
the experiments of Mrs. Foot afford abundant evidence of the ability of
woman to investigate any subject with originality and precision.
via Ana Unruh Cohen