Ozone and the Atmosphere. 



199 



Wales and Co., which can also be employed to illustrate the ef- 

 fect of ozone upon the above 

 mentioned solutions, the 

 ozonized oxygen being in 

 this case conducted by a 

 glass tube from the ozon- 

 izer to the surface of the 

 liquids in the tank. 



Preparation by Electricity. — The methods followed to sub- 

 mit the oxygen, in as dry and cold and condensed a condition 

 as possible, to the action of electricity, will be given in a subse- 

 quent paper. A large Holtz machine, manufactured byR.ub.m- 

 korff", did not answer satisfactorily as a source of frictional 

 electricity. Examination showed that the surface of the vul- 

 canite supports was coated with a saline incrustation, which 

 proved to be sulphates, probably formed by oxidation of the 

 sulphur contained in the vulcanite, under the influence of 

 ozone generated in the working of the machine. This saline 

 matter being hygroscopic, attracted sufficient moisture to de- 

 stroy insulation.* 



The insulation might have been restored, by removing the 

 coating ; but in the remainder of the experiments I used the 

 improved form of Holtz's machine, made by Messrs. Hall and 

 Benjamin, (see wood-cut), and obtained excellent results. 

 Various modifications of Siemens's apparatus, and the tube- 

 ozonizer of Prof. Wright, f were employed for ozonizing. 



* This difficulty had been previously noted by Prof. A. W. Wright, Am. J. Sci., [S], vol. 

 IV, p. 30. 

 t Amer. Jour. Sci., ib., p. 26. 



