Olde Raleigh - N.C. - Magnitite arc lamps illuminate the 100 block of West Martin Street (looking east) in the winter of 1917. During this time, these brightly illuminated sections of city
Experimental "Magnetic Arc-Spreading" compact fluorescent lamp | National Museum of American History
![Science of railways . the parabolic reflector, the hottest part of the beamis in the center, decreasing uniformly toward the periphery,and this undoubtedly accounts for a large part of the glassbreakage. Science of railways . the parabolic reflector, the hottest part of the beamis in the center, decreasing uniformly toward the periphery,and this undoubtedly accounts for a large part of the glassbreakage.](https://c8.alamy.com/comp/2CH1X13/science-of-railways-the-parabolic-reflector-the-hottest-part-of-the-beamis-in-the-center-decreasing-uniformly-toward-the-peripheryand-this-undoubtedly-accounts-for-a-large-part-of-the-glassbreakage-with-a-lens-however-the-light-rays-are-picked-upuniformly-and-projected-therefrom-and-the-heating-effect-isuniform-and-of-low-value-in-place-of-the-customary-carbons-the-arc-is-produced-by-locomotive-appliances-51-electrodes-the-positive-of-solid-copper-and-the-negative-com-posed-of-magnetite-in-a-steel-tube-the-arc-of-this-headlightis-then-a-magnetite-flame-arc-and-produces-a-brillia-2CH1X13.jpg)
Science of railways . the parabolic reflector, the hottest part of the beamis in the center, decreasing uniformly toward the periphery,and this undoubtedly accounts for a large part of the glassbreakage.
![An elementary book on electricity and magnetism and their applications . Fig. 324. — Flame arcmade with impregnatedcarbons beneath a vit-reous canopy. 462 ELECTRICITY AND MAGNETISM To-. Magnetite, etc. Fig. 325. — An elementary book on electricity and magnetism and their applications . Fig. 324. — Flame arcmade with impregnatedcarbons beneath a vit-reous canopy. 462 ELECTRICITY AND MAGNETISM To-. Magnetite, etc. Fig. 325. —](https://c8.alamy.com/zooms/9/6a3761d0bfa84f7398ec6a3aac9ece2c/2aj02cg.jpg)
An elementary book on electricity and magnetism and their applications . Fig. 324. — Flame arcmade with impregnatedcarbons beneath a vit-reous canopy. 462 ELECTRICITY AND MAGNETISM To-. Magnetite, etc. Fig. 325. —
![An elementary book on electricity and magnetism and their applications . Fig. 324. — Flame arcmade with impregnatedcarbons beneath a vit-reous canopy. 462 ELECTRICITY AND MAGNETISM To-. Magnetite, etc. Fig. 325. — An elementary book on electricity and magnetism and their applications . Fig. 324. — Flame arcmade with impregnatedcarbons beneath a vit-reous canopy. 462 ELECTRICITY AND MAGNETISM To-. Magnetite, etc. Fig. 325. —](https://c8.alamy.com/comp/2AJ02CG/an-elementary-book-on-electricity-and-magnetism-and-their-applications-fig-324-flame-arcmade-with-impregnatedcarbons-beneath-a-vit-reous-canopy-462-electricity-and-magnetism-to-magnetite-etc-fig-325-luminous-arc-lamp-with-copper-electrodeand-diagram-of-connections-unlike-other-arc-lamps-this-luminous-arc-lamp-fig-325-as-itis-sometimes-called-is-not-adapted-to-interior-use-on-constant-voltage-circuits-starting-resistance-vi-but-is-used-for-street-lighting-onconstant-currentcircuits-since-thismagnetite-arc-is-ad-c-lamp-it-isusually-suppliedfrom-a-c-lines-bymercury-arc-2AJ02CG.jpg)