Memoir On a New And Certain Method of Ascertaining the Figure of the Earth By Me
Memoir On a New And Certain Method of Ascertaining the Figure of the Earth By Me
M Antonio Cagnoli
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" It is worthy of observation that Maupertuis, who was one of the astronomers that measured the arc of the meridian in Sweden in 1736, makes the compression = p-f^, by comparing it with the arc then measured in France. But, M. Svanberg who, inl805, remeasured the same arc, deduces the compression =-3^. 4 when compared with the arc recently measured in France ; and ~"Sins-7 when compared with that of Bouguer at Peru. Tliis is CAGNOUS MEMOIR. 15 moreover bear in mind the enormous expence and labo...ur required in measuring a degree of the earth's* surface. Let us recollect the great uncertainty that may attend such a measurement from the deviation of the plumb-line made use of in the instruments^ employed for the astronomical observations, occa- sioned by mountains and valleys, subterraneous cavities and other irregularities in the upper strata however on the presumption that the standard measure, used in the survey, was equal to the double metre at zero of the thermometer : but, if it was so only at the temperature of + lG'^f, the corre- sponding compressions would be -j^-s- 9» «^iid -g-jr t* Other results are obtained according to the different tables of refraction made use of in the calculations; so that, after all, considerable doubts exist as to the exact quantity of the compression, as deduced from that survey.
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