Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 178
icular to FG will be in therequired line, and AB + EF+ CD = AD. By constructing two other per-pendiculars, BE and FC, the accuracy of the work will be increased. <& OBSTACLES TO CHAINING. 2. To measure across a body of water: Let it be required to measure the line ABCD (Fig. 3) crossing a… … Fig. 3. Then BQ= 400 links. For, by similar triangles, EF-. BG-..CE-. CB.But EF=2BG; hence, CE=2CB, and C5 = ££=400 links. EGand FG should be measured, in order to test the accuracy of the work.EG = FG = 500 links. Instead of the above distances, any convenient distances may be taken.For, if EF=…
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Works. Popular edition.] 2 series (1886)](https://img.insideoutlibrary.com/img/200/bl-bl_003191336_9-359-1.webp)
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-28-46.webp)
