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Updated: May 4, 2025
Here they parted company with their companions, the DICK and SAN ANTONIO, by an interchange of three cheers, the DICK having King's letters for conveyance to England. The course of the BATHURST was now south-west towards Cape Londonderry, sighting, during the next few days, Eclipse Hill, Sir Graham Moore's Islands, and Troughton Island.
From now onwards the places of stars were referred to the pole, not to the zenith; the zero being obtained from measures on circumpolar stars. Standard stars were used for giving the clock error. In 1816 a new transit instrument, by Troughton, was added, and from this date the Greenwich star places have maintained the very highest accuracy.
Bradley was succeeded by Bliss, and he by Maskelyne , who carried on excellent work, and laid the foundations of the Nautical Almanac . Just before his death he induced the Government to replace Bird's quadrant by a fine new mural circle, six feet in diameter, by Troughton, the divisions being read off by microscopes fixed on piers opposite to the divided circle.
He then turned to science, was appointed in 1813 to a professorship of astronomy and mathematics, and began regular work in the Dorpat Observatory just erected by Parrot for Alexander I. It was not, however, until 1819 that the acquisition of a 5-foot refractor by Troughton enabled him to take the position-angles of double stars with regularity and tolerable precision.
Eager to avail myself of the favourable state of the sky, I resolved to take a few solar altitudes with a sextant by Troughton of two inches radius. The disk of the sun was half-concealed by the mist. Whilst, seated on the rock, I was determining the dip of the needle, I found my hands covered with a species of hairy bee, a little smaller than the honey-bee of the north of Europe.
It would also be a most pleasant task to follow the evolution of our subject in the new era of investigation ushered in by the invention of that marvelous instrument, the telescope, followed closely by the work of Kepler, Scheiner, Cassini, Huyghens, Newton, Digges, Nonius, Vernier, Hall, Dollond, Herschel, Short, Bird, Ramsden, Troughton, Smeaton, Fraunhofer, and a host of others, each of whom has contributed a noble share in the elimination of sources of error, until to-day we are satisfied only with units of measurement of the most exact and refined nature.
Meanwhile the traditional reputation of the English school was fully sustained; and Sir George Airy did not hesitate to express his opinion that the new method of graduating circles, published by Troughton in 1809, was the "greatest improvement ever made in the art of instrument-making." But a more secure road to improvement than that of mere mechanical exactness was pointed out by Bessel.
Malcolm; "you have seen me use the common-room snuff-box to keep myself awake after dinner; but nothing more. I keep a box in my pocket merely as a bauble it was a present. You should have lived when I was young. There was old Dr. Troughton of Nun's Hall, he carried his snuff loose in his pocket; and old Mrs. Vice-Principal Daffy used to lay a train along her arm, and fire it with her nose.
Troughton, the governor's chaplain, and had arguments with him daily on theological points.
A sextant, by the famed makers Troughton and Sims, of Fleet Street; a chronometer watch, with a stop to the seconds hand an admirable contrivance for enabling a person to take the exact time of observations: it was constructed by Dent, of the Strand , for the Royal Geographical Society, and selected for the service by the President, Admiral Smythe, to whose judgment and kindness I am in this and other matters deeply indebted.
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