CHAPTER III. 



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 an 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. 



It should have 



A rack and pinion substage motion for adjust- 

 ment of the condenser with a centring arrange- 

 ment, 



An iris diaphragm and disc plate, 



A mechanical stage, and 



A coarse and fine adjustment. 



