A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 376
Lfrom the directrix is given, whatever be the po-sition of the line Pp. And because LT isparallel to PS, and L£ to pS, LP:TS: :LH:HT.andpL :St :.:LH :tH, therefore Lemma 1,P L-Lp : TS-SZ:: LHa:H T-fH.But TS-S* = DS-Sd, and TII-Hf=MH-Hw=LH!-LM!, fig.21,22, or = LM2 —LH2, fig. 23. Therefore PLLp:… … J-u, 0 B pr— ~~~~t° a/ si V c R \h \m </ 1 - 0 J.Shury Sculp! /on.l,;, I,,hi, -),... Thrums TtQtf i S tlmm-il. Psrrml.TU62S.
Encyclopedias and dictionaries · Aeronautics
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