. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. LABORATORY AND TEACHING METHODS 6S9 rectangular frame into which a drawing board is fitted. The fitting is grooved to allow the adjustment of the illuminant L by the lever G, the stage 0, and the objec- tive holder H, the face being graduated to J^ cm. in order that the correct position of the stage O, which varies according to the objective in use (see Table A), can be determined. The same table gives the correct size of diaphragm, five accompanying each outfit, viz.: 12, 18, 24, 32 an
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. LABORATORY AND TEACHING METHODS 6S9 rectangular frame into which a drawing board is fitted. The fitting is grooved to allow the adjustment of the illuminant L by the lever G, the stage 0, and the objec- tive holder H, the face being graduated to J^ cm. in order that the correct position of the stage O, which varies according to the objective in use (see Table A), can be determined. The same table gives the correct size of diaphragm, five accompanying each outfit, viz.: 12, 18, 24, 32 and 46 mm. diameter. The cover-glass faces the ob- jective when the slide with object is placed in position. The objective carrier H which has a rack and pinion for coarse adjustment and a micrometer screw for fine adjustment occupies a constant position on the fitting B, viz., i cm. from the lower. Fig. 233.—Ether or rhigoline freezing attachment for freezing microtomS. end, but can be removed if necessary. The fine adjustment can be controlled by a long rod similar to that used for the setting of the arc. Above the stage two lenses of digerent foci are mounted in a swing-out (iCj, Fig. 234) which has a sliding focussing adjustment and iris diaphragm, and is so contrived that either of the condensers or the diaphragm only can be interposed in the optic axis. The microscope body T can be removed from the fitting M, into which it pushes, and the triple nosepiece is mounted on a sliding attachment, so that it can be interchanged from a similar slide carrying the microsummar lenses. The draw tube should always be set at 152 mm. when working with the nosepiece; otherwise, at 170 mm. Should the apparatus be required for projection the whole optical. 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, Joh
Size: 1754px × 1424px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
