CHAPTER V. 



THE MICROSCOPE AND ACCESSORIES. 



THE MICROSCOPE. ITS ESSENTIALS. A SIMPLE 

 BASEBOARD. THE FOCUSSING GLASS. COM- 

 BINED LAMP AND BULL'S-EYE. LAMP AD- 

 JUSTMENTS. MAGNESIUM 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. 

 English pattern recommended. 

 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. 



One advantage of an adjustable tube length 

 is that it allows the use of objectives, 

 which may be corrected for either short 

 tube or long tube. 

 It should have 



A rack and pinion substage motion for adjust- 

 ment of the condenser with a centring 

 arrangement ; 



