Blackie's Handy Book of Logarithms Vier- und fünfstellige Logarithmentafeln

Abstract

IN order that mathematical tables intended for common use may serve their purpose, it is essential that great attention be paid to the labour-saving arrangements which authors have from time to time introduced, such as the careful grouping of the figures in rows and columns, the use of varied type or of differently coloured inks, marginal or thumb indexes, proportional differences, inverse functions, &c. On opening Blackie's “handy” volume, the reader will be disappointed to find that the compiler of the tables has paid little attention to the points enumerated above. A table of six-figure logarithms of four-figure numbers occupies twenty-two pages; the average difference for each row of figures is given, but there is no room found for proportional differences, so that the taking out of the logarithm of a five- or six-figure number involves an irritating calculation. Anti-logarithms are not included, but there is a table of hyperbolic logs. Sixteen pages are allotted to tables of natural and logarithmic functions of angles, for increments of one-sixth of a degree, without differences. Other tables include reciprocals, squares and square roots, cubes and cube roots, circumferences and areas of circles, heights and areas of circular segments, and rhumbs in degrees. There is an appendix giving some simple mensuration rules, some old-fashioned practical geometry, and definitions of the functions of angles, not as ratios, but as lengths.

Blackie's Handy Book of Logarithms.

Pp. 128. (London: Blackie and Son, 1904.) Price 2s.

Vier- und fünfstellige Logarithmentafeln.

Pp. 24. (Brunswick: F. Viewreg and Son, 1904.) Price 0.80 mark.