The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 268
uided along the line BD; A will, as is well known, describe the equi-tangential curve or tractory. Suppose that the guide to which thepoint B (or in an oblique position D), is attached, carries a verticalrule DFE, and that, on that rule, there slides a right angle DFC, oneside of which is… … F trace the Companion to the Tractory. A very simple addition willconvert this instrument into that described by Leslie in his Geometryof Curve Lines, for forming the catenary. A grooved rule has only tobe attached, making the right angle DCE, while the groove DF is con-tinued to meet it: E then…
Architecture · Civil engineering · Science
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