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 The success achieved by the previous editions of this work encouraged the author to undertake its extension to 100 feet. The extended part has, however, been tabulated by steps of 1/16" instead of 1/32" as the latter for lengths of over 50 feet would have little value, if any. The computation and checking of the extended part has been carried out in the same careful manner as the old tables and it is therefore believed that it is as accurate as the old tables proved to be. The parallel system of tabulation, visa the placing of the squares and logs. of the same numbers opposite each other, has been retained, this arrangement offering a number of advantages, namely: (1) The square and the log. of a number are often needed at the same time. (2) In many calculations the square of a number is given and its log. required or vice versa, the number itself being of no use to the calculator; the parallel arrangement of the tables enables in such cases the reading of the log. directly from its square or vice versa. (3) The log. of the square can be obtained by multiplying its corresponding log. item by 2. 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 application 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 triang

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