CONTENTS 
xi 
Page 
The Jentzsch reflecting condenser.,. 122 
The immersion ultramicroscope. 123 
CHAPTER VI. 
Useful Microscope Accessories; Laboratory Equipment; Work Tables; 
Radiants. 
Drawing cameras. 127 
Drawing eyepieces. 130 
Microspectroscopes. 131 
Calibration of microspectroscopes. 135 
Mechanical stages. 138 
Rotating and orientating devices. 141 
Lens holders. 145 
Reagent containers. 145 
Rods, platinum wires, pipettes. 148 
Spatulas. 148 
Forceps. 149 
Object slides. 149 
Watch glasses and evaporators. 152 
Burners for microchemistry investigations. 153 
Tongs. 15s 
Work tables. 156 
Microscope Lamps. 158 
Nosepieces and objective changers. 164 
Sedimentation glasses. 165 
The microscope as a polarimeter. 166 
Cover-glass and object slide gauge. 168 
Microtome. 169 
Tools. 169 
Sieves. 171 
CHAPTER VII. 
Micrometry; Micrometric methods. 
Determination of magnification. 172 
Different methods of measuring microscopical objects. 175 
Units employed. 175 
Methods of direct comparison. 176 
Micrometric microscopes. 177 
Micrometry with the mechanical stage. 180 
Micrometry with a camera lucida. 180 
Micrometry by means of micrometer oculars. 181 
Determination of the ocular micrometer ratio. 182 
Step micrometers. 185 
Contrast micrometers. 185 
Filar micrometers. 186 
