GREGORY

3.16 to 10, is laid upon the stock below the said groove. Thus, the square roots of numbers on the slider are exhibited either above or below it, upon the line, laid down on a piece of paper on which is the annotation Handwriting of Dr Olinthus Gregory, 4 x 1, on an 8vo. sheet, together with an engraved portrait, 4½ x 3½, no place, no date