Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 60
Where neither trammel nor string is at hand, this, perhaps, isthe most ready method of drawing an ellipsis. The divisionsshould be small, where accuracy is desirable. By this method,an ellipsis may be traced without the axes, provided that a diame-ter and its conjugate be given. Thus, a b and c d,… … 119.—To describe an ellipsis by intersecting arcs. Let a b 46 AMERICAN HOUSE-CARPENTER. and c d, {Fig. 85,) be given axes. Between one of the foci,/ and/, and the centre, e, mark any number of points, at random, as 1, 2 and 3 ; upon/and/ with h 1 for radius, describe arcs at g, g, g and g ; upon/…
Carpentry · Architecture
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