CONTENTS ix 



CHAPTER VI. 



USEFUL MICROSCOPE ACCESSORIES; LABORATORY EQUIPMENT; WORK TABLES; 



RADIANTS. 



PAGE 



Drawing cameras 102 



Drawing eyepieces 105 



Microspectroscopes 106 



Calibration of microspectroscopes no 



Mechanical stages 113 



Rotating and orientating devices 115 



Lens holders 118 



Reagent containers 119 



Rods, platinum wires, pipettes 121 



Spatulas 122 



Forceps 122 



Object slides 123 



Watch glasses and evaporators 126 



Burners for microchemistry investigations 126 



Tongs 129 



Work tables 129 



Radiants 132 



Nosepieces and objective changers 137 



Sedimentation glasses 139 



The microscope as a polarimeter 139 



CHAPTER VII. 



MICROMETRY; MICROMETRIC MICROSCOPES. 



Different methods of measuring microscopical objects 142 



Methods of direct comparison 143 



Micrometric microscopes 144 



Micrometry with a camera lucida 147 



Determining the magnifying power of a microscope 148 



Micrometry by means of micrometer oculars 149 



Determination of the ocular micrometer ratio 150 



Step micrometers 153 



Contrast micrometers 154 



Filar micrometers 154 



Micrometry by means of a scale projected by the Abbe condenser 155 



Use of the micrometer fine adjustment 157 



Measurements of thickness 158 



