ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



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stage of this old Microscope, does not appear to have been known, so far, 

 as an optician of the latter part of the eighteenth century. The Micro- 

 scope which bears this name has a close resemblance to instruments made 

 by George Adams about 1780, though it possesses some features and 

 variations of interest. 



The body is very large, tapering towards both ends, and fastened to 



Fig. 50. 



the limb by means of a dovetailed slot. The limb is a triangular bar 

 with the rack cut inside, after Benjamin Martin's plan ; it is joined 

 by means of a compass joint to a tall pillar raised on a folding tripod 

 base. The whole Microscope is made of brass, and very massive. 



The object-glasses, six in number, and consisting of single lenses, art- 

 mounted on a sliding bar, which is a feature of earlier Microscopes. 

 The stasre is triangular, and carries below a lens mounted in a tube, 



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