Hydraulic Investigations. 



133 



shall have r = ^5557 nearly, or, more accurately, r = 



•0000045 pv* q\ ■ . . 



. 1 hcsc calculations are compared with the 



whole of Dubuat's experiments in the following table. 



Table of Experiments on the Resistance occasioned by Flexure. 



In the last three experiments, the diameter of the pipe 



was two inches. The radius of curvature is not ascertained 



within the tenth of an inch, as Dubuat has not mentioned 



the thickness of the pipes. The mean error of his formula 



in fifteen experiments, and of mine in twenty, is -~ T of the 



whole. 



[To be continued.] 



13 



XXI. Ana- 



