Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 49
ccasion he took for me a mould of a Rowlands diffractiongrating, having 14,400 parallel lines to the inch. Like the originalit showed most gorgeous diffraction colours. 32 LIGHT LECT. piece of red paper,—that is to say of paper that reflectsred waves better than waves of any other colour,—andyou… … Fig. i 8. may be formed, according to the position of the mirrors.Here (Fig. 18) are two flat mirrors hinged togetherlike the leaves of a book. If I open them out to anangle equal to one-third of a circle—namely, 1200—andthen place a candle between them, each mirror will makean image, so that, when…
Light · X-rays
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![An illustration from Architectura curiosa nova, exponens 1. Fundamenta hydragogica, indolemq[ue] aquæ, aëris interventu in altum levandæ. 2. Varios aquarum ac salientium fontium lusus per varia spectatu jucunda epistomiorum seu siphonum genera. 3. Magnum amnissimorum fontium, machinarumq[ue] aquæductoriarum sumtu magno exstructarum, ac per Italiam, Britanniam, Germaniam &c. visendarum, numerum. 4. Specus artificiales sumtuosissimas, cum plerisq[ue] principum europæorum palatiis, hortis, aulis; nec non præcipuis monasteriis atq[ue] arcibus. 5. Cum auctario figurarum elegantissimarum, ad hortorum topiaria vario ductù dividenda, nec non conclavium laquearibus ac pavimentis segmentandis, itemq[ue] labyrinthis construendis, adhibendarum. Omnia 200 æri incisis... descripta (1664)](https://img.insideoutlibrary.com/img/200/ia-architecturacuri00bock-96-56.webp)
