Abstract
(1) THIS is a short text-book on gnomonics, and is not intended for people who merely want to put up a nice sun-dial as an ornament in their garden or grounds. There is not a single picture of an article of that kind: only geometrical diagrams. The aim of the author is a much higher one, and has been well accomplished by showing how in careful hands a sun-dial may be used to control a clock sufficiently well for ordinary purposes. After explaining the diurnal and annual motion of the sun, the necessary formulae are developed for tracing the hour-lines on horizontal and vertical dials and for correcting their indications for errors of adjustment. Convenient auxiliary tables are also given of the various trigonometrical functions, the equation of time, and the declination of the sun.
(1) Gnomonica: L'Orologio Solare a Tempo Vero nella sua Moderna Applicazione.
By G. Bottino Barzizza. Pp. viii + 199. (Milano: Ulrico Hoepli, 1915.) Price 2.50 lire.
(2) Lezioni di Cosmografia.
By Prof. Giovanni Boccardi. Pp. x + 233. (Milano: Ulrico Hoepli, 1916.) Price 3 lire.
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(1) Gnomonica: L'Orologio Solare a Tempo Vero nella sua Moderna Applicazione (2) Lezioni di Cosmografia. Nature 98, 326–327 (1916). https://doi.org/10.1038/098326b0
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DOI: https://doi.org/10.1038/098326b0
