The Foot 9 



E is the stage on which the object is placed. 



P is the limb carrying the body (G). 



At the lower end of the body is a nosepiece (H), having a 

 screw into which the objective is fitted. 



At the upper end of the body is a sliding fitting called 

 the draw-tube (J), by means of which additional magnifica- 

 tion may be obtained, and into this draw-tube the eyepiece 

 or ocular (K) fits. 



L is a rackwork, by means of which the body (G) is 

 raised and lowered in order to focus the objective upon the 

 object which is placed on the stage (E). 



M is the milled head controlling the fine adjustment, 

 which imparts a delicate motion to the body, in order that 

 the objective may be more exactly adjusted than would be 

 possible with the rackwork (L) when using high magnifying 

 power. 



N is a fitting for forceps, or side silver reflector ; and 

 are the springs with which the object is held in position. 



We have selected the instrument (Fig. 1) because, from 

 practical acquaintance with it, we are able to strongly 

 recommend it for a beginner's microscope, worthy of 

 receiving additions from time to time as means may 

 permit. Still, it should only be considered as a typical one. 



THE FOOT. 



Since the first edition of this book was issued, a decided 

 reaction has taken place in regard to the form of foot on 

 which the microscope is mounted. There has scarcely 

 been a modern writer of repute who has not urged the 

 necessity and importance of having such a mounting for 

 the microscope as shall secure for it absolute rigidity, 

 whether it be used vertically, inclined, or horizontally for 

 photography. No foot so fully answers these requirements 

 as the tripod pattern. Earely does it happen that the 

 bench or table on which work is done is absolutely level, 

 and the tripod is the only pattern that naturally adjusts 



