Abstract
American Journal of Science, September.—On the gas thermometer at high temperatures, by L. Holborn and A. L. Day. The authors seek for a type of gas pyrometer yielding the most trustworthy results, and eventually decide in favour of the iridio-platinum bulb as against porcelain. They fill the bulb with nitrogen, and use a saltpetre bath up to 750°, a zinc bath up to 900°, and electric heating for still higher temperatures, since flame gases pass bodily through the metal.—On the flicker photometer, by O. N. Rood. The general idea of the photometer, which is independent of colour, is that the differently coloured beams of light traversing its axis should illuminate the two surfaces of a rectangular prism, facing the eye, and that by the oscillations of a cylindrical concave lens its illuminated surfaces should alternately and in rapid succession be presented to the eye.
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