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 36
Fig. 9. 1 This paraffin slab photometer is the invention of Dr. Joly,V. R.S., of Dublin. It is an exceedingly satisfactory instrument. Light No.11 Light No.2 7\ / w \ … Either of these two forms of instrument here described is preferableto the old-fashioned grease-spot photometer of Bunsen. Butboth are surpassed in accuracy by the precision-photometer of 20 LIGHT LECT. semi-opaque property of paraffin wax, which results ina diffusion of the light laterally. With…
Light · X-rays
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