. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. LABORATORY AND TEACHING METHODS 583 $. Note the optic combinations used and keep a record of them with the calcu- lated micrometer value. Repeat for each of the other combinations. To meas- ure an object by this method, read off the number of divisions of the eyepiece micrometer it occupies and express the result in microus by looking up the standard value for the optic combination used. Example.—Detetraine how many of the stage micrometer divisions correspond with the eyepiece micromet
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. LABORATORY AND TEACHING METHODS 583 $. Note the optic combinations used and keep a record of them with the calcu- lated micrometer value. Repeat for each of the other combinations. To meas- ure an object by this method, read off the number of divisions of the eyepiece micrometer it occupies and express the result in microus by looking up the standard value for the optic combination used. Example.—Detetraine how many of the stage micrometer divisions correspond with the eyepiece micrometer divisions. Divide the first by the last, the quotient will be the true value of the ocular micrometer divisions in units of the objective micrometer. If 20 divisions of the ocular micrometer cover 87 divisions of the stage micrometer then ^Jio = 43-5 = mm. Method with Filar Micrometer (Fig. 207).—This consists of an ocular having a fixed wire stretching horizontally across the field with a vertical reference wire. £ITZ^WET2L«f. 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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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
