38o 



SCIENCE. 



[Vol. XIV. No. 357 



Figs. 4 and 5 are plan and sectional views of the ignition valve. 

 The valve a (Figs. 3, 4, and 5) is mounted on a pivot at the rear of 

 the combustion chamber of the cylinder, and has a number of 



ture. The disk a is, by the intermittent mpttdn imparted to it, 

 brought into position at the required time for igniting the mixture 

 in the cylinder. The slot or small gas-chamber f g in the disk a. 



ratchet-teeth {e) around its circumference. It is rotated by a pawl, 

 I, worked by a small crank at the end of the side shaft, and a con- 

 necting link, n. The cylinder being [charged with compressed ex- 

 plosive mixture, the port d is also charged with the gaseous mix- 



which is approaching the port d, receives inflammable gas from the 

 fixed gas-ducty in the cover b, the passagey^ in the rotating disk a 

 being brought opposite during the motion of the said disk, and 

 communicating with the duct or curved sloty in the cover b. The 



