.14 



THE STEUCTURE OF THE NUCLEUS. 



the coronas of water particles with the coronas produced under like circumstances 

 by lycopodiuni particles (diameter = D^), for which <i = D„ = XjR/.%. Hence 



d = DoV« = .00144/5, if Do = .0032 cm. 

 This makes it needless to select any particular wave length provided the same 



annuhis is used throusrhout. 



•000. 



Fic. 3. — Chart Showing the Diameters (cm) of Cloud Particles of Benzol 

 IN THE Successive Exhaustions. 



Fig. 4. — Chart Showing the Decrease in Aperture (s) of the Coronas of 

 Benzol Vapor, during the Succf.ssive Exhaustions ; also the Final Apertures 

 of Water and Petroleum Vapor in the Same Scale. 



In the present cha])ter the goniometer, fig. l<t, opened horizontally, being 

 carried in a light tripod, (r, which could be moved at pleasure on a smooth table. 

 In the following chapters the goniometer, fig. lb, was used vertically, the jaws 



