. Elementary chemical microscopy . Fig. hi. Method of Indicating Magnification. to the paper, it should be recalled that when light is reflected, the angle between the incident and deflected ray is equal to twice the angle of inclination of the mirror. Hence, in order that the axial rays shall fall normal to the drawing surface, the mirror of the camera must be set at 45 degrees. But if so placed, only about one-half the field of the microscope can be sketched. In order to increase the available field, the mirror must be tipped at an angle less than 45 degrees with the horizontal. This, howeve
. Elementary chemical microscopy . Fig. hi. Method of Indicating Magnification. to the paper, it should be recalled that when light is reflected, the angle between the incident and deflected ray is equal to twice the angle of inclination of the mirror. Hence, in order that the axial rays shall fall normal to the drawing surface, the mirror of the camera must be set at 45 degrees. But if so placed, only about one-half the field of the microscope can be sketched. In order to increase the available field, the mirror must be tipped at an angle less than 45 degrees with the horizontal. This, however, causes distortion, unless the drawing surface is inclined. The amount of inclination is in accordance with the law of reflection stated above, that is, that the drawing paper must form an angle with the horizontal twice as great as the angular amount the mirror is depressed below 45 degrees. Having the records of the magnifying power of the various possible optical combinations, in order to obtain the dimensions of an object, it is only necessary to measure the image obtained with the camera lucida under identical conditions and divide this value by the magnification.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmicroscopy, bookyear1
