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๐ SIMILAR VOLUMES
## Halogen lamps have been on the market for some time; they are replacing the conventional lamp in many fields except general service (domestic) applications. Their relatively small bulbs contain small amounts of halogen in addition to an inert gas. The mode of action of the iodine lamp, which de
All the advance made in illuminating engineering has been made by utilizing higher and higher temperatures. Attempts at producing light by the electric current were made by heating wire conductors to a high temperature, and the first attempt at an incandescent lamp was with a platinum wire; but plat
Pilot Flame Ignition of Incandescent Gas Lamps. C. xvV. JOR-DAN. (Transactions of the Illuminating Engineering Society, September 20--23, i915.)--The subject of pilot flame ignition of incandescent gas lamps may appear to many to be rather a minor or unimportant detail of the broad general subject o