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The author, at the commencement of this paper, refers to the 12th volume of the Asiatic Researches, in which there are detailed accounts of two complete sections of an arc on the meridian, measured by him in prosecuting the Trigonometrical Survey of the Peninsula of India. The first is comprehended between the parallels of Punnse, a station near Cape Comorin, in latitude 8° 9' 38".39, and Patchipolliam in Coimbetoor, in latitude 10° 59' 48".93. The second is comprehended between the parallels of Patchipolliam and Namthabad, a station near Gooty in the ceded districts, in latitude 15° 6' 0".21. Since those measurements, the author has obtained another section, extending from Namthabad to Daumergidda, in the Nizam’s dominions, which being in latitude 18° 3' 23".6, gives a total arc of 9° 53' 45".14 in amplitude. From the first of these sections, Colonel Lambton finds the length of the degree due to latitude 9° 34' 44" (the middle point of that arc), equal to 60472.83 fathoms. The second section, whose middle point is in latitude 13° 2' 55", gives the mean degree equal to 60487.56 fathoms; and the last section gives the degree equal to 60512.78 fathoms due to the latitude of 16° 34' 42", the middle point of that section.

abstracts of the papers printed in the philosophical transactions of the royal society of london

An abstract of the results deduced from the measurement of an arc on the meridian, extending from latitude 8° 9' 38".4, to latitude 18° 3' 23".6 N., being an amplitude of 9° 53' 45".2