28 McCretianpd AND Hackert—Secondary Radiation from Compounds. 
In this paper the secondary radiation from a number of compounds has been 
measured experimentally, and compared with the value calculated on the lines 
mentioned above, It may be stated at once, that the calculated and the 
ELecTROMETER 
experimental values show very good agreement, and thus confirm the theory 
that the action is an additive atomic property. 
