. The microscope; an introduction to microscopic methods and to histology. Microscopes. CH. K] DRA WING WITH TLIE MICROSCOPE 123 inversion is a great objection, as it is necessary to similarly invert all the details added free-hand. (B ) By a camera lucida reflecting the rays of light from the draw- ing paper, etc., so that their direction when they reach the eye coin- cides with the direction of the rays from the microscope (Fig. 58, 109). In all of the camera lucidas of this group, the rays from the paper are twice reflected and no inversion appears. /. - 11 \ v_ XI J i\ -" l\ '! \ l\ «
. The microscope; an introduction to microscopic methods and to histology. Microscopes. CH. K] DRA WING WITH TLIE MICROSCOPE 123 inversion is a great objection, as it is necessary to similarly invert all the details added free-hand. (B ) By a camera lucida reflecting the rays of light from the draw- ing paper, etc., so that their direction when they reach the eye coin- cides with the direction of the rays from the microscope (Fig. 58, 109). In all of the camera lucidas of this group, the rays from the paper are twice reflected and no inversion appears. /. - 11 \ v_ XI J i\ -" l\ '! \ l\ « \ L\ x , a \ 1 T^-— —-Hi ll I r Hi Fig. 110. Fig. hi. Fig. 109. Fig. 109. Abbe Camera Lucida with the mirror at /50, the drawing surface horizontal, and the microscope vertical. Axis, Axis. Axial ray from the mi- croscope and from the drawing surface. A, B. Marginal rays of the field on the drawing surface, a b. Sectional view of the silvered surf ace on the upper of the tri- angular 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. Foot. 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 450. 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. iio. Geometrical figure showing the angles made by the axial ray with the drawing surface and the mirror. A,B. The drawing surface. Fig. in. Ocular showing eye-point, E. P. It is at this point both horizontally and vertically that the hole in the silvered surface should be placed {}. 182).. Please note that these images are extracted from scanned page images that may have been digitally e
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