Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 479
e aperture in front of the camera, through whichissues the beam reflected by the mirror x y. Let the distance of the mirror from the carbon-pointsbe such as to render the reflected beam slightly convergent.Fill a glass flask r with the solution of iodine, and placeit in the path of the reflected… … little beyond the flask combustion and calorescence maybe produced. Flasks with diameters from 1 \ to 3 inchesare well suited for the experiments. By the arrangement here described, I have raisedplatinum to redness at a dark focus 22 feet distant fromthe source of the rays. The best mirror,…
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