2 Jones and Bower, Explosion Wave Pressures. 



tinned-iron wheel, capable of being rapidly rotated about 

 a horizontal axis, the rim upon which the photographic 

 film is placed being i^in. wide. 



The lenses of the camera are arranged so that an image 

 of the explosion tube placed horizontally and parallel to 

 the axis of the wheel may be focussed on the rim. Since 

 the explosion travels along the glass tube horizontally 

 and the wheel is revolving in a vertical plane, the image 

 of the flash on the film appears as a line inclined to the 

 horizontal, the sine of this angle varying inversely as the 

 velocity of the flash, provided the rate of the wheel is 

 constant. 



A photograph of the flash immediately after it has 

 passed an imperfect junction in the apparatus is shown 

 vcvfig. /. The explosion wave has been partially checked, 

 and the point of redetermination is clearly visible. 



The second figure shows the collision of two partially- 

 destroyed explosion waves before they have had time to 

 recuperate. 



In the case illustrated by the third figure, the explo- 

 sion wave has been alternately determined and checked 

 two or three times. This was brought about by having 

 three strong glass tubes placed horizontally and parallel 



