250 



PROGRESS IN MICROSCOPY 



in Fig. 10.8. The object of Fig. 10.9 is to show the identical devices SP 

 and RC in greater detail and their different locations. As mentioned 

 previously, the motor MO actuates the specimen through the selsyn 



Fig. 10.8. Diagram of the Caspersson microspectrophotometric equipment for surveying 



quantitative cytochemistry appUcations. 



Sli and Sli. The latter (Fig. 10.9) actuates a screw that penetrates 

 into a chamber and, by compression, ahers the mercury level in Bi. 

 The pressure causes the mercury to rise into Bo thus shifting the 

 diaphragm actuating the specimen P. The motor MO drives also the 

 recorder D whose pen /, driven by the device RC (itself driven by the 



