. The microscope and its revelations. • IMIIIS nr\v mrrliiuiiral v THE MECHANICAL STAGE 183 and these hold the slip by the two lower corners, as seen in fig. 142 ;and this mode of gripping allows for the employment of the in-valuable method of touch on the edge of the slide for discoveringworking distance and focus. A plain sliding bar may be substitutedfor the mechanical bar ; this forms a semi-mechanical stage as shownin fig. 144. The mechanical movement being only imparted to thelugs at the side of the stage, the bar may be moved by the hand bysliding as in an ordinary plain stage without t
. The microscope and its revelations. • IMIIIS nr\v mrrliiuiiral v THE MECHANICAL STAGE 183 and these hold the slip by the two lower corners, as seen in fig. 142 ;and this mode of gripping allows for the employment of the in-valuable method of touch on the edge of the slide for discoveringworking distance and focus. A plain sliding bar may be substitutedfor the mechanical bar ; this forms a semi-mechanical stage as shownin fig. 144. The mechanical movement being only imparted to thelugs at the side of the stage, the bar may be moved by the hand bysliding as in an ordinary plain stage without the employment of themechanical movement. The stage is of aluminium, and its size is 4^ x 7 inches. Another attachable stage having many advantages is made byReichert and shown by fig. 145. It can be used with any instrumentof the Continental type, is very carefully made, and the scales. PIG. 145.—Reicherts attachable stage. (About half natural size.) (1892.) attached are divided to read by means of a vernier to O10 mm., andthe range of movement is an inch in both directions. An attachable mechanical stage is also made by the Bausch andLomb Optical Company of Rochester, New York, having greatmerit and some special points; and this firm is in advance of allother makers that we know of in making an attachable revolvingmechanical stage. There is much similarity to the American mechanical stage in onemade by Carl Zeiss and illustrated in fig. 146. Of course the principle,as primarily in all the others, is that suggested by the late Mr. Mayall,and afterwards by Reichert. Two sliding pieces, mounted at rightangles to one another, are moved by means of two milled heads, S, pass along millimetre scales which serve to record any particularposition. The demand for these attachable stages is, we presume, consider- 184 THE H1>TKY AND DEVELOPMENT OF THE MICROSCOPE :iMr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
