. The microscope and its revelations. mici,and adapted to the horizontal microscope by Chevalier. The eyelooks through the microscope at the object (as in the ordinary viewof it), instead of looking at its projection upon the paper, the imageof the tracing point being projected upon the field—an arrangementwhich is in many respects more advantageous. This is effected bycombining a perforated silver-on-glass mirror with a reflectingprism ; and its action will be understood by the accompanyingdiagram (fig. 219). The ray a b proceeding from the object, afteremerging from the eye-piece ofthe micro
. The microscope and its revelations. mici,and adapted to the horizontal microscope by Chevalier. The eyelooks through the microscope at the object (as in the ordinary viewof it), instead of looking at its projection upon the paper, the imageof the tracing point being projected upon the field—an arrangementwhich is in many respects more advantageous. This is effected bycombining a perforated silver-on-glass mirror with a reflectingprism ; and its action will be understood by the accompanyingdiagram (fig. 219). The ray a b proceeding from the object, afteremerging from the eye-piece ofthe microscope, passes throughthe central perforation in theoblique mirror M, which is placedin front of it, and so directlyonwards to the eye. On the otherhand, the ray a, proceeding up-wards from the tracing point,enters the prism P, is reflectedfrom its inclined surface to theinclined surface of the mirror M,and is by it reflected to the eyeat b, in such parallelism to theray b proceeding from the objectthat the two blend into one A valuable and simple littlecamera was devised by Mr. E. in It takes intoaccount the fact that while that form known as Beales neutral tint (fig. 218) has been of greatvalue and persistence, it is yet a defective form ; the microscopicimage as received at the eye-piece is inverted and camera corrects the inversion, while it leaves the transposi-tion unaltered; therefore all the objects drawn with this cameraare unlike the originals. In illustration place the letter p on1 Journ. B, M. S. 1895, p, 21 ei seq. 280 ACCESSORY APPARATUS the stage in the position as here printed; when, examined by themicroscope it will appear thus J. In order to look at this letter asthe original, all that we have to do is to turn this paper this object, as drawn by a Beales camera, will appear q, and noturning of the pa pel- can cause it to appear as the original; it willonly become so when it is viewed as a transparency from t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
