Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States (1883)
Vose, George L. (George Leonard), 1831-1910 · Boston : Lee and Shepard · leaf 40
Fig- 3- In passing from A to B (Fig. 4), by the several routes A B C D,we should have the corresponding profiles shown in Fig. 5 ; RECONNOISSANCE. 15 from which it appears that the nearer to the head of thestreams we cross, the less is the difference of elevation tobe overcome. … F>g- 4- Barometrical Measurement of Heights. The relative height of summits, the rate of fall of streams,and absolute elevations within a few feet, may be easily andrapidly ascertained by means of the barometer. The principleinvolved in this mode of levelling is, that the density of theair, by…
Railroad engineering
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