f essential conditions. In Careful observations have been made,and recorded, addition there is a distinct point of likeness in the Trowbridge of the Department of Physics of Columbia from which the height of the meteor trains seen at type of spectrum of the visible afterglow and the University. Mr.… … mentioned. that it is the On the passage of the current there is produced within the bulb same as for Photometer for Measuring the Bate of Decay of Luminosity. a discharge, which causes the gas in the tube, in this case rarefied p h o s p hores- air, to glow and the glass itself to phosphoresce.…
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