. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 6s8 LABORATORY EXERCTSES The Edinger drawing and projection apparatus' (Figs. 234, 23s) projects micro- scopic objects even under a high magnification directly upon the drawing board so that the outline can be traced in pencil. The image thus projected can be used for demonstrating to a small audience and also for photomicrography. For such work a powerful illuminant is used with a hand-fed electric arc taking 4 amperes. It may be used with a suitable plug connected with the direct-curr
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 6s8 LABORATORY EXERCTSES The Edinger drawing and projection apparatus' (Figs. 234, 23s) projects micro- scopic objects even under a high magnification directly upon the drawing board so that the outline can be traced in pencil. The image thus projected can be used for demonstrating to a small audience and also for photomicrography. For such work a powerful illuminant is used with a hand-fed electric arc taking 4 amperes. It may be used with a suitable plug connected with the direct-current house supply (alter- nating current may be used by special arrangement). The crater in the positive. Fig. 232.—Clinic microtome with freezing attachment. carbon from which Ught emanates is brought to coincide with the optic axis of the apparatus by means of the two screws (a) as in Fig. 234, and tiie lamp with the con- densing system K can be moved along the optic axis by the lever G. The distance between tiie carbons is regulated by the milled head (6) which if out of reach of the operator can be turned by the long handle connected to (c). The smaller car- bon which is placed horizontally should not project into the optical axis, or crater area of the larger vertical carbon. The apparatus proper consists of a cast-iron pillar S, Fig. 234, mounted upon a ' May be had of E. LeiU, 30 East i8th Street, New ^'ork 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
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Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
