Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 387
Fig. 804.—Erroneous method of arrangement for diffused daylight. Iiaving the mirror fixed upon a sliding tube, so that its focal pointmay be adjusted. It is also important here to note that in daylight illumination … Fig. 305.—Light from the open sky falls upon the mirror in all directions. a plane mirror gives a cone of illumination, as in fig. 305, when thereis ample sky-room; but a window acts as a limiting diaphragm. In regard to the parallelism of the direct solar rays there is ofcourse no question. But…
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-340-231.webp)
