CHAPTER V. 



THE MICROSCOPE AND ACCESSORIES. 



THE MICROSCOPE ITS ESSENTIALS A SIMPLE 

 BASEBOARD THE FOCUSSING GLASS THE 

 BULL'S-EYE CONDENSER AND LAMP MAG- 

 NESIUM RIBBON. 



A good second-hand microscope may often be 

 purchased at less than half its original cost. Cheap 

 microscopes by unknown makers are useless for 

 photography, therefore it is better to get a good one 

 second-hand than a poor one new. In selecting 

 such a one the following points are desirable : 

 The maker should be one of good repute. 

 The body tube should be preferably of short 

 length with full-size eyepiece and coated 

 dead black inside. 

 Rackwork draw tube to give loin, when 



extended. 

 It should have 



A rack and pinion substage motion for adjust- 

 ment of the condenser with a centring 

 arrangement ; 



An iris diaphragm and disc plate ; 

 A mechanical stage ; and 

 A coarse and fine adjustment. 



