. The microscope and microscopical methods. Microscopes; 1896. ii4 DRA WING WITH THE MICROSCOPE. [CH. V. Fig. ioS. Fig. Fig. 106. Fig 109. Figs. 106-109. Abbe Camera Lucida in position to avoid distortion. Fig. 106. The Abbe Camera Lucida with the mirror at 350. Axis, Axis. Axial ray from the microscope and from the drawing surface. A B. Drawing surface raised toward the microscope 20°. Foot. The foot or base of the microscope. Mirror with quadrant {Q). The mirror is seen to be at an angle of 3$°. Ocular. Ocular of the microscope. P, P. Drawing pencil, and the cubical prism over the ocul
. The microscope and microscopical methods. Microscopes; 1896. ii4 DRA WING WITH THE MICROSCOPE. [CH. V. Fig. ioS. Fig. Fig. 106. Fig 109. Figs. 106-109. Abbe Camera Lucida in position to avoid distortion. Fig. 106. The Abbe Camera Lucida with the mirror at 350. Axis, Axis. Axial ray from the microscope and from the drawing surface. A B. Drawing surface raised toward the microscope 20°. Foot. The foot or base of the microscope. Mirror with quadrant {Q). The mirror is seen to be at an angle of 3$°. Ocular. Ocular of the microscope. P, P. Drawing pencil, and the cubical prism over the ocular. W. Wedge to support the drawing board. Fig. 107. Geometrical figure of the preceding, showing the angles made by the axial ray with the mirror and the necessary elevation of the drawing board to avoid distortion. From the equality of opposite angles, the angle of the axial ray reflected at 35° must make an angle of no° with a horizontal drawing board. The board must then be elevated toward the microscope 20° in order that the axial ray may be perpendicular to it, and thus fulfill the requirements necessary to avoid dis- tortion {\ 170, 174). Fig. 108. Upper view of the prism of the camera lucida. A considerable portion of the face of the prism is covered, and the opening in the silvered surface appears oval. Fig. 109. Quadrant to be attached to the mirror of the Abbe Camera Lucida to indicate the angle of the mirror. As the angle is nearly always at 43°, 40°, or 33°, only those angles are 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
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