Excerpt from Smoley's Tables: Parallel Tables of Logarithms and Squares, Angles and Logarithmic Functions, Corresponding to Given Bevels and Other Tables, for Engineers, Architects, Etc

In an article by Mr, F. D. Davis entitled: Smoley's Tables; Some Convenient Methods by Their Use, published in the Engineering News of Dec. 25, 1902, Mr. Davis is discussing this special feature of these tables (visa their parallel arrangement) demonstrating the usefulness resulting from it by applying the tables to a number of' examples relating mainly to mensuration. But in the opinion of the writer the parallel combination of the tables finds its most effective field of appli cation in the solution of triangles for the purpose of figuring the data required for structural detail drawings. The most general problem we have here to deal with is this: With two given sides of a right-angle triangle, usually the main dimensions of the frame (as in a roof truss the half span and rise), to find: 1, the hypothenuse 2, the bevel or slope; 3, the log. Functions of the angles of the triangle, the latter for the purpose of figuring the diagonals of the frame, etc. _not only does the parallel combination of the tables enable the figuring of these three data in one process of calculation, but they are mutually checkingeach other at the same time. In examples VI and vili, pages 328 and 330, the hypothenuse, bevel, log tang. (visa the log. Of the bevel) and log. Sec. Are obtained, the log. Of any other function can be figured in the same manner as the log sec.

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