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Scientific American, Vol. 70, No. 3 (1894) (1894)
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ltitudes who could | source of illumination. It has long been known that the are in a never have permanent po- seen the ob- sition, it has ject them- not been gene- selves. With rally adopted greater perfec- for projection tion comes purposes. In greater useful- the form of ness, so_ that lamp here… … © 1894 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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