Philosophical transactions, Vol. L. Part II. For the year 1758. / Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.

by Various; Royal Society

Here b = 994; c = 820; v = 2¼; 4a = 64,3596.

Now 25b ⁄ 21c = 24850 ⁄ 17220 = 1,443.

And 1,443² = 2,082; And 2,082 - 1 = 1,082 = (25b ⁄ 21c)² - 1.

Also vv = (9 ⁄ 4)² = 81 ⁄ 16; And vv ⁄ 48 = 81 ⁄ 16 × 64,3696 = 0,0786.

Then 1,082 × 0,0786 = 0,084 feet, the fall sought.

Which is about 1 inch; and is about half an inch more than the greatest fall observed by Mr. Labelye.

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LXIV. An Account of the Earthquake in the West Parts of Cornwall, July 15th 1757. By the Rev. William Borlase, M. A. F.R.S. Communicated by the Rev. Charles Lyttelton, LL.D. Dean of Exeter, F.R.S.

Read Jan. 26, 1758.

ON Friday the 15th of July, 1757. a violent shock of an earthquake was felt in the western parts of Cornwall.