International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 99
rtical rod held perfectly plumb. Fig. 303 shows the method of keeping sketch and notes intopographical work. 688 SURVEYING. 1302. An efficient topographical survey is one which fully serves every purpose for which it is made. Itsvalue depends more upon the accuracy of that which isrepresented… … Fig. 303. ingly, taking nothing for granted and never indulging inguesswork. 1303. The Aneroid Barometer.—Fig. 304 showsan aneroid barometer, a substitute for the mercurial barom-eter, which latter is not readily portable. It consists of abox of thin corrugated copper, exhausted of air. An…
Railroad engineering
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