g spiral lines one-sixth Nernst lamp, but the galvanometer is supplanted by scribed in these columns, only photographs of faces of a millimeter apart. The differences of relief of the an apparatus known as the Blondell oscillograph, from can be transmitted to a distance, since pictures of picture… … Frangaise de Photographie. sufficient distinctness. This problem, however, has rheostat connected with the line, currents of an intens- small mirror scarcely two or three millimeters in been solved in a much more perfect manner by a diameter, and of an extreme sensibility of movement. ity…
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