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An Account of a Method of dividing Astronomical and other Instruments, by ocular Inspection in which the usual Tools dor graduating are not employed" the whole Operation being so contrived, that no Error can occur but what is chargeable to Vision, wh...
(London, W. Bulmer and Co., 1809). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1809 - Part I. Pp. 105-145 and 3 fine engraved plates, showing instruments.
First appearance of the importent description of the division of the circle, invented by Troughton.One of Troughton's most important contributions was a method of dividing a circle. His paper on this, An account of the method of dividing astronomical and other instruments by ocular inspection in the Philosophical Transactions of the Royal Society in 1809 won him the Copley medal of the Royal Society. In this invention is described in detail and also put into context. ""Troughton made many contributions to the development of instrument making: in 1788 an improvement of Hadley's quadrant" in 1790 a mercurial pendulum" and in 1796 a refined version of the Borda, or reflecting circle. He was responsible for substituting spider web filaments for hair or wire in his optical instruments.....Troughton's most notable achievement was the improvement of the method of dividing a circle. His paper on this in 1809 won him the Copley Medal from the Royal Society, which elected him as fellow the following year.""(DSB). - Poggendorff II: 1140.
An Account of a Method of dividing Astronomical and other Instruments, by ocular Inspection in which the usual Tools dor graduating are not employed" the whole Operation being so contrived, that no Error can occur but what is chargeable to Vision, wh...
(London, W. Bulmer and Co., 1809). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1809 - Part I. Pp. 105-145 and 3 fine engraved plates, showing instruments.
First appearance of the importent description of the division of the circle, invented by Troughton.One of Troughton's most important contributions was a method of dividing a circle. His paper on this, An account of the method of dividing astronomical and other instruments by ocular inspection in the Philosophical Transactions of the Royal Society in 1809 won him the Copley medal of the Royal Society. In this invention is described in detail and also put into context. ""Troughton made many contributions to the development of instrument making: in 1788 an improvement of Hadley's quadrant" in 1790 a mercurial pendulum" and in 1796 a refined version of the Borda, or reflecting circle. He was responsible for substituting spider web filaments for hair or wire in his optical instruments.....Troughton's most notable achievement was the improvement of the method of dividing a circle. His paper on this in 1809 won him the Copley Medal from the Royal Society, which elected him as fellow the following year.""(DSB). - Poggendorff II: 1140.
On the Declinations of Some of the Principal Fixed Stars" With a Description of an Astronomical Circle, and Some Remarks on the Construction of Circular Instruments.
(London, W. Bulmer and Co., 1809). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1809 - Part II. Pp. 420-454 and 1 large folded engraved plate depicting the large Circle Instrument (41x26 cm.).
The paper records observations made at Westbury and describes a simple method of correcting latitudes at places.""The observations..were made..in the years 1800 and 1801 with an Astronomical Circle of twoo feet and a half in diameter, constructed by Mr. Troughton, and considered by him as one of the best divided instruments he had ever made"" a drawing of it, with a short description, is annexed to the observations.""""Troughton made many contributions to the development of instrument making: in 1788 an improvement of Hadley's quadrant" in 1790 a mercurial pendulum" and in 1796 a refined version of the Borda, or reflecting circle. He was responsible for substituting spider web filaments for hair or wire in his optical instruments.....Troughton's most notable achievement was the improvement of the method of dividing a circle. His paper on this in 1809 won him the Copley Medal from the Royal Society, which elected him as fellow the following year.""(DSB).
Catalogue of Astronomical Instruments and Observatory Equipment. Publication N° 700 A ( trade catalogue ) .
London and York, , Cooke , Troughton & Simms Ltd, s.d. (ca. 1932-1933), in-4° , 64 pp with black/white illustrations. Sewn, original stiff wrapper. ( wrapper stained and soiled, interior fine.) Rare trade catalogue of astronomical instruments and equipment fabricated by Cooke, Troughton & Simms, at that time a subsidiary of Vickers Ltd. Loosely inserted, a quotation dated 13th Oct. 1934 for a telescope.
Furred Animals of Australia.
1973 (new ed.) xviii, 314 p., 25 col. pls, hardbound (dust jacket).
