8 Gibson, Draught produced by an Inclined Rod. 



Experiment V. 



Conditions as in III. and IV., except that poker is 

 moved V nearer blast pipe and from frame. Weaker 

 draught than in III. and IV. 



From these results it is clear that in practically every 

 case the draught, over the region explored, was very 

 sensibly increased by the presence of the poker, the 

 proportional effect being greater with the smaller inclina- 

 tion. The effect was even more marked at a short 

 distance past the tip of the poker than in the plane 

 containing the tip. 



In Experiment V., where the proportional increase 

 was greatest and amounted to as much as 83%, the inten- 

 sity of the draught was less than in any other experiment, 



