Autobiography of Sir George Biddell AiryAiry, George Biddell
Science
Autobiography of Sir George Biddell Airy
Airy, George Biddell
Airy, George Biddell, 1801-1892; Astronomers -- Great Britain -- Biography; Autobiographies; Royal Greenwich Observatory
"In the Minutes of the Visitors it is noted that the new Queen's
Warrant was received. The principal change was the exclusion of the
Astronomer Royal and the other Observatory Officers from the
Board.--In the Report to the Visitors it is stated that 'The Papers of
the Board of Longitude are now finally stitched into books. They will
probably form one of the most curious collections of the results of
scientific enterprise, both normal and abnormal, which exists.'--It
appears that the galvanic communications, external to the Observatory,
had been in a bad state, the four wires to London Bridge having
probably been injured by a thunderstorm in the last autumn, and the
Report states that 'The state of the wires has not enabled us to drop
the Ball at Deal. The feeble current which arrives there has been used
for some months merely as giving a signal, by which an attendant is
guided in dropping the Ball by hand.'--Regarding the new Equatoreal
the Report states that 'For the new South-East Equatoreal, the
object-glass was furnished by Messrs Merz and Son in the summer of
last year, and I made various trials of it in a temporary tube carried
by the temporary mounting which I had provided, and finally I was well
satisfied with it. I cannot yet say that I have certainly divided the
small star of gamma Andromedae; but, for such a test, a combination of
favourable circumstances is required. From what I have seen, I have no
doubt of its proving a first-rate object-glass.'--On March 15th was an
annular eclipse of the Sun, for the observation of which I sent
parties fully equipped to Bedford, Wellingborough, and Market
Harborough. The observations failed totally in consequence of the bad
weather: I myself went to Harrowden near Wellingborough.--Respecting
the Altazimuth, the Report states that with due caution as to the zero
of azimuth 'the results of observation are extremely good, very nearly
equal to those of the meridional instrument; perhaps I might say that
three observations with the Altazimuth are equivalent to two with the
Transit Circle.'--Respecting Meteorological Observations the Report
states that 'The observations of the maximum and minimum thermometers
in the Thames, interrupted at the date of the last Report, have been
resumed, and are most regularly maintained. Regarding the Thames as
the grand climatic agent on London and its neighbourhood, I should
much regret the suppression of these observations.'--After much
trouble the longitude of Edinburgh had been determined: 'the retard of
the current is 0.04s very nearly, and the difference of longitudes 12m
43.05s, subject to personal equations.'--The Report concludes thus:
'With regard to the direction of our labours, I trust that I shall
always be supported by the Visitors in my desire to maintain the
fundamental and meridional system of the Observatory absolutely
intact. This, however, does not impede the extension of our system in
Public-domain text, read in full here on John Shaqi.
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