A Manual of Rules, Tables, and Data. By D. K.
Clarke, C.E. (Mackie and Son).—A very handy and reliable book of reference for mechanical engineers, containing tables of strength of materials and constructions, weights and measures, specific gravities, weights of metals, logarithmic tables, &c. It is compiled from the best authori- ties, both English and foreign, clearly printed, and conveniently arranged.—We have also to notice The Whitworth Measuring Machine, by T. M. Goodeve, M.A., and C. P. B. Whalley, C.E. (Longmans and Co.), an account of the wonderful invention of Sir Joseph Whitworth for measuring to the one-millionth of an inch. The mechanical student will read this, and the descriptions of surface planes and other instra- ments of measurement, with profit.—The Handbook of the Slide-Rule, by W. H. Bayley (G. Bell and Sons), is a reprint of a former edition on the mode of using this useful instrument, by which calculations of almost every kind may be readily approximated.
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