508 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



condenser lens with large magnification. The temperature is indicated 

 by a thermometer and can be extended up to 100° C. 



In the Strieker pattern the stage forms a metal chamber through 

 which warm water can be passed. A condenser lens and thermometer 

 are used, as in the last. The stage can be screwed to a table. 



Fig. 102. 



Leitz' Drawing Board (Simple Form).* — This is shown in 

 fig. 103 inclined at 12% at which angle it is adapted for use with Leitz' 

 camera ocular, series No. 92. 



Fig. 103. 



Fig. 104. 



Fig. 104 shows Giesenhagen's drawing board. In this apparatus the 

 board may be adjusted at various angles, and raised or lowered with 

 facility. 



* Catalogue. No. 41 (Mikroskope) 1905, p. 81. 



