Aspects of scienceSullivan, J. W. N. (John William Navin)
Philosophy
Aspects of science
Sullivan, J. W. N. (John William Navin)
English essays -- 20th century; Science
But although Schröter is undoubtedly the most amusing of all amateur
observers, he has had his prototypes in all countries. Francis Baily,
the “philosopher of Newbury,” is a good example of our more sober
English product. We may have doubts as to what sort of chief magistrate
old Schröter was, but we know that Baily took his profession of
stockbroking with the utmost seriousness. He did not allow astronomy
to interfere with business. Beginning in 1799, he remained on the
Stock Exchange in London for twenty-four years, devoting his leisure
largely to solar observations, particularly those connected with
eclipses. It is with two of these phenomena, the first annular, a
ring of the sun being visible round the moon, and the second total,
that Baily’s name is particularly associated, in each case for the
vivid and accurate account he gave of what he witnessed. The first
phenomenon, a ring of bright points extending round that part of the
moon’s circumference which has just entered on the solar disc, is
merely a consequence of the lunar edge being serrated with mountains.
These “Baily’s beads,” as they were called, were successful, however,
in stimulating interest in the physical aspect of eclipses, with the
result that the next total eclipse, that of 1842, was looked for with
an unprecedented degree of enthusiasm. Astronomers like Airy, Otto
Struve and Arago travelled to Central or Southern Europe to observe
the eclipse, and the indefatigable Mr. Baily accompanied them. He
fitted up his telescope in an upper room of the University of Pavia.
The result was magnificent. At the instant of totality the sun appeared
decorated with a glorious _auréole_, the famous corona. It was
not, of course, an unknown phenomenon, but it had never before excited
so much attention. Mr. Baily, in particular, was moved to write a most
eloquent description of this flaming object. He calls it splendid and
astonishing, but continues: “Yet I must confess that there was at the
same time something in its singular and wonderful appearance that was
appalling; and I can readily imagine that uncivilised nations may
occasionally have become alarmed and terrified at such an object....”
Besides being a specialist on eclipses, Baily was an untiring editor
of star-catalogues, and he also made no fewer than 2,153 laborious
experiments, on Cavendish’s method, to determine the density of the
earth. He was indeed a zealous worker in what Sir John Herschel called
the “archæology of astronomy.” He was noted for his unvarying health,
undisturbed equanimity and methodical habits.
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