Gernsback, Hugo, 1884-1967, ed · New York : [s.n.] · leaf 8
s way be operated on 3 to 4 times thanks to Edison and other investigators — the bulb. Indeed, it is said that the re- the normal voltage, vastly increasing the we are actually paying many times what efficiency and illumination of each filament sults produced are identical with those we should… … the photographing of interiors. The incon- accomplish this a number of incandescent Top Center View — A "Cold Light" Projector veniences attending the use of ordinarj- . lamps are arranged in a circle on a of the Dussaud Type Intended for Use by magnesium flash powder are well known. rotatable disc…
