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.

    9/200 (page 5)
    Channel, at all events executed, it was therefore propofed to Comte de Cassini, who by this time had been appointed by the Academy of Sciences to fuperintend their part of the bufinefs, that he thould fix the time that might fuit him beft for our meeting on the coaft; that we would then difcontinue the ope- ration to the weftward, and, having in concert executed the coaft triangles, we would refume the inland parts of our own feries at fome more convenient opportunity. This propofition being readily aetcded to by Comte DE Cassini, the 20th of September was appointed for our re- pairing to the coafts of Dover and Calais refpe&ively. In the mean time our operation was continued, with all ima- ginable care and affiduity, through the fir ft ten ftations of the feries of triangles from Hampton Poor-houfe to that at Wrotham Hill inclufively. The inftrument, and the various parts of the apparatus, were then removed to Dover, at which place Me(T. de Cassini, Mechain, and le Gendre, three diftinguifhed Members of the Academy of Sciences, arrived on the 23d of September. In the courfe of two days that thefe Gentlemen honoured us with their company at Dover (and we regretted exceedingly that the latenefs of the feafon did not admit of our enjoying that pleafure for a much longer period) every thing was fettled in the moft amicable manner pofiible, with regard to the times of reciprocal obfervation. A great number of white lights, fitted for long diftances, and feveral reverberatory lamps had been previoufly provided. Having been fupplied with fuch a proportion of the lights as feemed necefifary for their fide of the channel, and one of the lamps, the French Gentlemen departed for Calais on the 25th, accompanied by Dr. Blag den, who attended them during the B time