Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 128
,»••. ^L —^ Fig. 136. Fig. 137. c N a ::^ A 5=^- ^ a « c ^ ^ Fig. 13&. Fig. 139^ elliptical, a h and h c being given tangents to the curve; parallelto which, the semi-conjugate diameters, a d and d Cj are draAVn.^In Fig. 132 and 133, the lines, a d andc? c, are semi^axes, thetangents, a b and b…
Carpentry · Architecture
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-411-238.webp)
