A. W. Wright—Production of Ozone with Electricity. 27 
an annular space of some two or three millimeters 
breadth around it. The gas is admitted through one of the 
branch tubes and escapes from the other, after having passed 
through the whole length of the tube. 
n using the apparatus the wires must be connected with the 
poles of the machine in such a manner that the disk becomes the 
hegative terminal, as this arrangement gives the greatest degree 
of expansion and diffuseness to the current. On turning the 
machine, and adjusting the ball and disk to a proper distance, 
a nebulous aigrette surrounds the latter, quite filling the inter- 
val between it and the wall of the tube, while the part of the 
tube between the disk and ball is crowded with innumerable 
hazy streams converging upon the positive pole, or simply caus- 
ing the latter to be covered with a faint glow. A current of 
air or oxygen sent into the tube must pass through this, and 
ozone is very rapidly produced, and in great quantity. The 
condensers are of course not used with the machine, when this 
apparatus is employed. 
ere appears to be an advantage in causing the oxygen to 
pass from the negative toward the positive within the tube, for 
the gas through which the discharge pone is transported in 
the contrary direction, as may be readily seen on bringing a 
candle flame between the au Hh of the machine, or causing a 
in column of smoke to rise through the polar interval. The 
flame and the smoke are deflected, and stream off toward the 
Negative pole. If the gas should be admitted in the direction 
mentioned, { there would be a tendency to obstruct its flow some- 
