Rensselaer Republican, Volume 18, Number 21, Rensselaer, Jasper County, 28 January 1886 — Photographs. [ARTICLE]

Photographs.

Among the wonders of photography it is said that, with a lens made of rock salt, it might be possible to photograph in the dark. One operator has succeeded in preparing plates which are sensitive to. the rays lying beyond the red end of the spectrum— the dark heat rays—and with such plates used with a rock salt lens there should be a possibility of photographing bodies which possess a high temperature, although that temperature mtiy be far below that needed to render them self-luminous. It is even possible that such a plan may soriie day be so perfected as to give us that information about the “dark suns” that are believed to crowd the firmament —or, rather, heavenly bodies, which once were seen, but have now cooled down so as to be invisible.