An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.

  • Roy, William, 1726-1790.
Date:
[1790]
Catalogue details

Licence: Public Domain Mark

Credit: An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy. Source: Wellcome Collection.

    15/200 (page 11)
    ©bferver, as well as an able and Indefatigable calculator. This teftimony, which is jufldy due to his merit, joined to the fipe- cimen which he gives of his mathematical abilities in the fifth fedion of this Paper, can fcarcely fail of making him better known hereafter; and it is hoped, that he will have opportu- nities of exerting his talents, by affifting in the continuation of the future operations that are projected and recommended to be carried on in the conclufion of this Memoir; the various parts of which are arranged as follows t Section Firjh Defcription of the apparatus made ufe of in the meafure- meat of the bafe of verification in Romney Marfli, with the hundred-feet fteel chain, in the autumn of 1787, with the refult of that operation. Reference to be had to Plate I. and II., and alfo to the table containing the general detail of the mea- furement. Seffiion Second\ General defcription of the great inftrument with which the angles in the recent trigonometrical operation were obferved 1 fhewing alfo its various adjuftments for pradice. Reference to be had to Plate III. a general view of the entire machine | Plate IV. a plan and two fedions of it; Plate V. various parts reprefented on large fcales; and Plate VI. the microfcopes and eye-pieces. SeSiton Third. Defcription of various articles of machinery made ufe of in the courfe of the trigonometrical operation, referred to in Plate VII. Alfo the diftindion of the ftations into two fets ; thofe of the fecond fet being referred to in Plate VIII. Sediion