624 



RECORD OF CURRENT RESEARCHES, ETC, 



In tlie new Microscope of Mr. George Wale these difficulties are 

 obviated by means of a rotating clip, shown in the annexed woodcut. 



In this form the stage is circular, but immovable ; near the outer 

 edge of the stage, both on the upper and the under sides, are two 

 narrow circular grooves, in which slide two pins attached to a bar, 

 which lies beneath the stage (as shown in the figure) and which carries 

 the clips. To the middle of the bar is attached a spring, which keeps 

 the frame of the clips in place on the stage. 



This arrangement not only allows the clips to rotate round the 

 stage, and thus permit the object to be placed in any direction as 

 regards the light, but it enables the microscopist to remove the clips 

 instantly from the stage, and thus leave a clear space for work when 

 the Microscope is used in a vertical position. The clips may also be 

 placed on the imder side of the stage, so as to hold the slide from 

 beneath. In this way light of the utmost degree of obliquity may be 

 used, as the stage then vii-tually has no thickness whatever. 



Contrivance for holding Objects beneath the Stage.* — Dr. Phin 

 himself describes in his Journal the contrivance which we quoted 

 and figured under this heading (at p. 466) from an English con- 

 temporary. In addition to what is there said. Dr. Phin remarks that 

 another important feature of the sub-stage is that if the spriug clips 

 be made very light the arrangement serves as a safety stage, and the 

 most delicate slides may be used even by bunglers without danger of 

 having the slide or cover fractured. 



* ' Am. Journ. Micr.,' iv. (1879) p. 92. 



