Rough Ways Made Smooth: A series of familiar essays on scientific subjectsProctor, Richard A. (Richard Anthony)
Science
Rough Ways Made Smooth: A series of familiar essays on scientific subjects
Proctor, Richard A. (Richard Anthony)
Science
Thus provided, Professor Watson, so soon as totality began, searched
on the eastern side of the sun, and there saw certain stars belonging
to the constellation Cancer, where the sun was situate at the time. He
then examined the western side of the sun, and having swept out to a
star which he took to be Zeta Cancri (though he was rather surprised at
its brightness,--but of that more anon) he returned towards the sun,
encountering on his way a star of the fourth magnitude or rather less,
about two degrees to the west of the sun. Close by was the star Theta
Cancri; but Theta was much fainter, and was seen at the same time a
little further west. It is not easy to understand why Watson did not
make comparison between the position of the new star and Theta, instead
of making comparison between the new star, the sun, and the star which
he took to be Zeta. For a comparison with a known object so close as
Theta would have given more satisfactory evidence than a comparison
with objects farther away. However, as he distinctly states in a letter
to Sir G. Airy that the new star was very much brighter than Theta
Cancri, which was seen a little farther to the west, we cannot doubt
that he had sufficient evidence to prove the new star and Theta Cancri
to be distinct orbs.
He adds that there was no appearance of elongation, as might be
expected if the new object were a comet. It had a perceptible disc,
though the magnifying power was only forty five.
The accompanying figure will serve to give a fair idea of the position
of the stranger.
[Illustration: Fig. 1.--Watson's new Planet.]
Now comes the evidence which was at first supposed to be strongly
corroborative of Watson's observation,--the recognition of a star of
about the fourth magnitude, near Theta Cancri, by Professor Louis
Swift, who observed the eclipse from Pike's Peak, in Colorado.
Professor Swift also made some rather unusual arrangements with his
telescope, but they were not altogether so well adapted to advance his
purpose as were Professor Watson's. To prevent the instrument from
swaying he tied what he calls a pole (but what in England I imagine
would be called a stick), ten feet long, about a foot from the eye-end
of the telescope, leaving the other end of this singular appendage
to trail on the ground. (The telescope was set low, Professor Swift
judging, it would seem, that the most comfortable way to observe was
to lie on his back.) As a natural consequence, while he could move his
telescope very readily one way, trailing the stick along, he could not
move it the other way, because the stick's end immediately stuck into
the ground. As the stick was on the west of the telescope, Professor
Swift could move the eye-end eastwards, following the sun's westwardly
motion. Of course the telescope was to have been released from the
stick when totality began, but unfortunately Professor Swift omitted
to do this, so that he had to work during totality with a hampered
telescope.
Public-domain text, read in full here on John Shaqi.
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