68 



Microscopical Essays, 



mahogany pyramidical box, which forms the body of the micro*- 

 fcope ; it is fupported firmly on the brafs pillar F G, by means of 

 the focket H, and the curved piece I K. 



L M N is a guide for the eye, in order to direcl it in the axis of 

 the lenfes ; it confifts of two brafs tubes, one Aiding within the 

 other, and a vertical flat piece, at the top of which is the hole for 

 the eye. The outer tube is feen at M N, the vertical piece is 

 reprefented at LM. The inner tube may be pulled out, or 

 puttied in, to adjuft it to the focus of the glafles. The vertical 

 piece may be railed or deprefled, that the hole, through which 

 the object, is to be viewed, may coincide with the center of the 

 field of view ; it is fixed by a milled fcrew at M, which could not 

 be {hewn in this figure. 



At N is a dove-tailed piece of brafs, made to receive the dove-tail 

 at the end of the tubes M N, by which it is affixed to the wooden 

 box ABCDE. The tubes MN may be removed from this box 

 occafionally, for the convenience of packing it up in a lefs compafs. 



O P a fmall tube which carries the magnifiers. 



O one of the magnifiers; it is fcrewed into the end of a tube,, 

 which Aides within the tube P; the tube P may be unfcrewed 

 occafionally from the wooden body. 



QRSTVX a long fquare bar, which paries through the 

 fockets Y Z, and carries the ftage or frame that holds the objects; 

 this bar may be moved backward or forward, in order to adjuft it 

 to the focus, by means of the pinion which is at a. 



