A familiar introduction to the study of polarized light; with a description of, and instructions for using the table and hydro-oxygen polariscope and microscope / [Charles Woodward].

  • Woodward, Charles
Date:
1848
Catalogue details

Licence: Public Domain Mark

Credit: A familiar introduction to the study of polarized light; with a description of, and instructions for using the table and hydro-oxygen polariscope and microscope / [Charles Woodward]. Source: Wellcome Collection.

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    K, Hemming’s safety tube screwed on the frame A B, sur- mounted by a wire gauze safety cylinder and jet, and con- nected by a tube of flexible metal with the bladder F. L, a cylinder of soft lime or chalk, made to revolve conti- nuously by clock-work, or occasionally by the hand. M, a frame moving to and fro between beadings on the stand A B, so as to adjust the distance of the condensers from the lime light. N, the lantern attached to the frame M by one screw at the ~ back, and furnished with two screws in front, admitting a lateral and vertical adjustment. QO, a circular opening in a brass plate for receiving the condensers. Fig. 23.—Condensers for the gas polariscope. Fig. 24.—Condensers for the gas microscope. Fig. 25.—The lowest power adapted for the gas polariscope or microscope. On a scale of one quarter to an inch. Fig. 23.—Tubes sliding the one within the other, contain- ing the condensers for the gas polariscope; the first being a crossed lens of 2? inches diameter, and 2} inches focus; and the second a slightly crossed lens of the same diameter, and 9 inches focus. Fig. 24.—Tubes containing the condensers for the gas microscope of the same diameters as those of Mig. 23, the first being a plano-convex lens of 34 inches focus, and the second a crossed lens of 44 inches focus. Fig. 25.—The lowest power, Fig. 18, adapted for the gas apparatus by substituting an eye lens (a) of 14 inch diameter and 2% inches focus, and placing it nearer the field-lens. (77.) The condensers, Fig. 23, are to be screwed into the lantern, and the polariscope, Fig. 15, which is made to slide D
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