Abstract
WHEN Scheele in 1777 projected the visible spectrum upon silver chloride, he was on the verge of discovering ultraviolet radiation, but it escaped his attention. Ritter in 1801 noted the effect on silver chloride of what proved to be this new type of radiation. This was the starting-point of a series of discoveries of photochemical effects made in the early part of the nineteenth century. The limit of transparency of ordinary glass is in general at about 340 millimicrons. Quartz crystals were found to be transparent as far as 185 millimicrons. Instruments employing quartz made it possible to extend the ultraviolet spectrum greatly, and by using fluorite Schumann extended the explored region from 200 to 120 millimicrons. Lyman placed the light source in an exhausted spectrograph chamber, and by employing a reflection grating was able to extend the known spectrum to about 50 millimicrons. Recently, Millikan has spanned the gap between these short ultraviolet rays and X-rays.
Ultraviolet Radiation: its Properties, Production, Measurement, and Applications.
By M. Luckiesh. Pp. xi + 258 + 12 plates. (London: Crosby Lock-wood and Son, 1923.) 21s. net.
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Our Bookshelf. Nature 112, 823–824 (1923). https://doi.org/10.1038/112823a0
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DOI: https://doi.org/10.1038/112823a0
