International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 392
will read to 10 seconds. On RAILROAD CONSTRUCTION. 981 bridges of great length the angle readings are taken in threesets of five readings each, and the average of all acceptedas the correct reading. This mode of angle measurementwas adopted in measuring the span of the Washingtonbridge over the… … FIG. 464. urement to be practically correct. The length of the sideA G, i. e., the span, is determined by the principles oftrigonometry (see Art. 1243), as follows: Sin 57° 29 35 : sin 59° 01 03.3:: 599.569 : side A G. sin 59° 01 03.3 = .85733599.5G9 X .85733 = 514.028491sin 57° 29 35…
Railroad engineering
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