Surveying and Levelling Instruments, Theoretically and Practically Described. / For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field.

by William Ford Stanley

879.—Hudson's Slide Rules give strength of shafts, beams, and girders; pump duty; and computation of horse-power in engines.

880.—Honeysett's Hydraulic Slide Rule gives discharge of water from channels and pipes of different forms and inclinations.

881.—Tacheometrical Slide Rules with scale of sine² and sine × cos. for calculating the horizontal equivalents and vertical heights from tacheometrical observations. These are made either for use with instruments divided sexagesimally to 360° or centesimally to 400.

882.—Sheppard's Slide Rule has duodecimal lines, double reading, for squaring and cubing timber.

883.—Young's Slide Rule is designed for squaring and valuing timber simultaneously, which operations it performs in a very expeditious manner.

884.—Essex's Slide Rule is the best for calculating the rates of velocity and discharge from sewers, water mains, channels, and culverts of different forms, as it works with all formulæ.

885.—The Slide Rule of Prof. Geo. Fuller, C.E., Fig. 427, presents perhaps the highest present refinement of this class of rules, capable of greatly facilitating the numerous arithmetical calculations of the civil engineer. Its range is greater than most calculating machines, and besides the operations of multiplication and division, squaring and cubing, results requiring the reciprocals, powers, roots, or logarithms of numbers can be quickly and easily worked out by its use.

Fig. 427.—Professor Fuller's calculating slide scale.

Larger image