. The microscope : an introduction to microscopic methods and to histology. Microscopes. 142 DRA WING WITH THE MICROSCOPE [CH. V of the rays from the drawing paper, pencil, etc. In some of the camera lucidas from this group (Wollaston's, Figs. 108, 112), the rays are reflected twice, and the image appears as when looking. â 1 ll rlr^- <**% Fig. 126 Fig. 124. Abbe Camera Lucida with the mirror at 45°, the drawing surface horizontal, and the micro- scope vertical. Axis, Axis. Axial ray from the microscope and from the drawing surface. A, B. ' Marginal rays of Fig. 124 the field on t
. The microscope : an introduction to microscopic methods and to histology. Microscopes. 142 DRA WING WITH THE MICROSCOPE [CH. V of the rays from the drawing paper, pencil, etc. In some of the camera lucidas from this group (Wollaston's, Figs. 108, 112), the rays are reflected twice, and the image appears as when looking. â 1 ll rlr^- <**% Fig. 126 Fig. 124. Abbe Camera Lucida with the mirror at 45°, the drawing surface horizontal, and the micro- scope vertical. Axis, Axis. Axial ray from the microscope and from the drawing surface. A, B. ' Marginal rays of Fig. 124 the field on the drawing surface, a b. Sectional view of the silvered surface on the upper of the triangular prisms composing the cubical prism (P). The silvered surface is shown as incomplete in the center, thus giving passage to the rays from the microscope. Fool. Foot or base of the microscope. G.' Smoked glass seen in section. It is placed between the mirror and the prism to reduce the light from the drawing surface. Mirror. The mirror of the camera lucida. A Quadrant (Q) has been added to indicate the angle of inclination of the mirror, which in this case is 45°- Ocular. Ocular of the microscope over which the prism of the camera lucida is placed. P, P. Drawing pencil and the cubical prism over the ocular. Fig. 125. Geometrical figure showing the angles made by the axial ray with the drawing surface aud the mirror. A, B. The drawing surface. Fig. r26. Ocular showing eye-point, E. P. It is at this point both hor- izontally and vertically that the hole in the silvered surface should be placed (.1203).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. Ithaca, N. Y. : Comstock Publishing Company
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