Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 33
s from the pins to the pencil; viz.,x XM, FM, &c, is invariable. 18. Eccentricity. Ellipses differ among themselves.±x the foci are near the centre of the ellipse, the ellipseapproaches the form of a circle; but if the foci departwidely from it the length of the conjugate axis is smallin… … bigs. 9 and 10, two ellipses are exhibited which differgreatly in their eccentricity; one being almost a circle,and the other very oval. 1. Eccentric, from ex out of, and centrum centre, (Latin) out of thtcentre. Construct an ellipse 1 What is meant by the term eceentricity 1 22 ASTRONOMY. 19. A…
Astronomy
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