Litteratur. 775 Gilbert S. Ram. The incandescent lamp and its manufacture. London, The Electrician print. and publ. eomp. [Nature 50, 1—3, 1894f. A. ü. Page. Incandescent lamps: their use and abuse. Electr. World 24, 102—104. G. L. Thayer. Grounds on incandescent circuits. Electr., New- York 17, 317—318. A. Crova. Sur le degre d’incandescence des lanipes. Eclair, electr. 1, 474—476. The efficiencies of glow-lamps. Electr., London 33, 537—539. A. S. IIatch. Testing for grounds on incandescent circuits. Electr., New-York 17, 391—392. E. Jona. Eine italienische Glühlampe. ZS. f. Elektron, Wien 1894, 128. The Turnbull incandescent lamp. Electr. Rev. 35, 498—499. Heavy gases in incandescent lamps. Electr., New-York 17, 278—279. R. B.