E. M. NELSON ON EVOLUTION OF THE MICROSCOPE. 



115 



to them, to ensure a smooth motion in the groove in which they 

 slide. George Lindsay was a watchmaker in the Strand,* which 

 accounts for the excellent workmanship found in his microscopes. 

 The date of the patent of this microscope is 1743; but it is 

 stated by the inventor, in an account of the instrument, that 

 he designed and made it in the year 1728. If this earlier date 

 could be established, it would be the earliest known instance of 

 an English microscope fitted with a mirror. 



There is a perfect specimen of one of these pretty microscopes 

 in the cabinet of the Royal Microscopical Society, which is dated 



Fig. 22. 



1742, and numbered 22 ; it is therefore in all probability the 

 earliest existing example of an English microscope with an 

 attached mirror as well as of the Lieberkuhn. The outside 

 measurements of its box are 3yg x 2|- x ly^g- deep. 



The last microscope to be noticed at this time is an important 

 one — viz., Cuff's, Fig. 23. The post AB is fixed to a square 

 box foot, and the stage is fixed to this post. The bar behind 

 and parallel to the post, to which the Umb D carrying the body 

 is attached, slides in the socket B. The thumbscrew in front 

 clamps C, which is fixed to the movable bar, to the post A. 

 The method of focussing is therefore simple and effective. The 

 * At ye Dial near Catherine Street in ye Strand. 



