Evening Republican, Volume 15, Number 161, Rensselaer, Jasper County, 10 July 1911 — Photographing the Sea Bottom. [ARTICLE]

Photographing the Sea Bottom.

In France experiments have been made that promise considerable success In submarine photography. A specially constructed camera was carried down by a diver to a depth of twenty-two or twenty-three feet, and, with an exposure of half an hour, negatives were obtained, which were fairly satisfactory. It was found that the best results were obtained by placing a blue glass In front of the lens. It is Intended to have Improved lenses specially eonstructed for underwater work in . France. Flashlight photographs of the sea bottom during a storm have been obtained. This light was furnished by an alcohol lamp fed by a reservwtr of oxygen. Magnesium powder was projected Into th< flame through a tube from the shore. It is thought that such flashlight photographs may be made at any depth to which a diver may descend.—Harper’s Weekly.