For Probs. 18.1 to 18.6, using the virtual-work method, determine the deflection of each of the joints marked on the trusses shown in the accom- panying illustrations. The circled figures are areas in sq. in and E - 29 x 10 psi unless otherwise indicated. Problem 18.1 U, vertical, U, horizontal 30k 30% U₂ 다. (2) 20k -20 ft- www -20 ft- 15 ft

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Instruments for Surveying

Surveying is the practice that determines the relative three-dimensional positions of many different points on the earth’s surface. There are various instruments used in Surveying like Theodolites, Total station, Tripod stands, Plane table, etc. for measuring horizontal angle, vertical and sloping angle, which are very useful for giving accurate and precise measurement.