174 Transactions of the Society. 



24. James Smith (1841). 



• This stand has become a model on which many English stands 

 have since been made. A substantial pillar mounted on a solid 

 tripod supports a grooved limb, which itself carries directly the 

 body, stage, and mirror. Coarse-adjustment is effected by rack- 

 and-pinion moving the'body, whilst the line-adjustment for the first 

 time by lever and screw acts on the nose-piece only. The 

 mechanical stage has rectangular' motion, and can be rotated. 



Described and figured in Microscopic Journal, ii., p. 1, and m 

 Journ. E.M.S., 1900^ p. 553; and 1909, p. 660. 



25. Andrew Hoss (1841). 



The pillar is mounted on a circular base, which rotates so as 

 to increase the steadiness of the base when the Microscope is 

 inclined. The body slides in the grooved limb, and the fine- 

 adjustment acts by a lever on the nose-piece. The mechanical 

 stage has rectangular movements and also rotates. 



Described and figured in Journ. E.M.S., 1899, p. 214; and 

 1909, p. 660. 



26. Edvin Qnehett's Microscope (1844). 



This instrument was designed and mainly constructed by 

 Dr. Quekett, the founder of the Eoyal Microscopical Society. 

 Whilst following James Smith's IMicroscope in general arrange- 

 ment, this model is characteri;^ed by greater rigidity of the foot 

 and pillar. The mechanical stage is made on A. Ross's pattern. 

 Below the stage there is a focusing condenser. Bequeathed to 

 the Society by Dr. Quekett, who died June 28, 1847. 



(See Journ. R.M.S., 1909, p. 660.) 



27. PoiocU and Zealand (1848). 



This model is the first example in which the Microscope is 

 hanging in a tripod, and is also the first example in which the fine- 

 adjustment moves the nose-piece by means of a lever within a 

 bar. The mechanical stage has Turrell's rectangular movement, 

 and possesses a focusing condenser. This type of Microscope 

 appears to have been first made in 1843, but, as in all the features 

 mentioned it is being reproduced at the present day, it may be 

 said to represent the modern instrument. 



This instrument is described and figured in the Journ. R.M.S., 

 1898, p. 125 ; 1901, p. 727 ; and 1909, p. 660. 



