. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 28o USE OF THE MICROSCOPE dividing i by .0225, which would give 44.4. Then the number of stomata in one square millimeter would be 9 times 44-4 = 399-6- The other method of drawing to scale is carried out with a camera lucida, the most convenient form of which is shown in Fig. 151. The main structural details of this instrument are, behind the opening P a prism silvered on one of its surfaces excepting for a narrow circular area at the center; and the plane. Fig. 1
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. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 28o USE OF THE MICROSCOPE dividing i by .0225, which would give 44.4. Then the number of stomata in one square millimeter would be 9 times 44-4 = 399-6- The other method of drawing to scale is carried out with a camera lucida, the most convenient form of which is shown in Fig. 151. The main structural details of this instrument are, behind the opening P a prism silvered on one of its surfaces excepting for a narrow circular area at the center; and the plane. Fig. 151.—TCamera lucida. M, l^irror; F, opening to reflecting prism; K, knobs for regu- lating diaphragms that govern illumination from object and drawing paper. mirror at M. Through the unsilvered part of the prism one can look and see the object; the mirror reflects the drawing paper placed on the table below it to the silvered surface of the prism and this reflects it into the eye. In this way the object and the drawing paper and the pencil held over the drawing paper are all seen at once superimposed; the object appears spread out over the paper and with the pencil its outlines can easily be traced. To use the camera lucida successfully it is necessary to have some means of illuminating the object and drawing paper with equal intensity, for if one appears brighter than the other they cannot both be seen with equal clearness. If the objecj, for instance, is too bright the point of the pencil cannot be accurately followed, and if the paper has the stronger illumination the. 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 work.. Stevens, William Chase, 1861-. Philadelphia, P. Blakiston's Son