STANDARDIZATION AND EFFICIENCY OF THE FOG CHAMBER. 



TABLE 10. Standardization of fog chamber. Coronal disks. Mercury lamp. Phos- 

 phorus nuclei. Cock open 5 sec. Temperature 24. [<?/>' 2 ] = 17.0 cm.; dp 3 = 17.6 cm. ; 

 (?/>'= 18.9 cm.; y=(p n [dp 2 ])/(p x) =-770', ^/ > 3/^ >=o - 2 3 I ; 7^ = 2.2 cm. m = 

 4.iXio- 6 g. 



In parts I to IV of table 10 the angular diameter 5' of the green disks 

 only was measured. The diameter s of the corresponding first minima 

 may, however, be obtained by using the method of reduction found in 

 parts V and VI, where 5 = 0.44 + 0.85 s'. 



In parts V and VI the data for s' and 5", the angular diameter of the 

 inner edge of the first ring are both observed, while in parts VII and VIII 

 data for s' and s'" ', the outer diameter of the first ring, appear. 



