Oh the Rejjjlance of Bodies mving in Fluids. g i ; 



dwts. grs. 



r Ji:.dge z ..... — 



At 80° incl. ) Middle w - ... - 3 



3 



I Edge X ..... 10 17 



f Edge z 



At 70" incl. < Middle «-..._ 6 



2 



LEdge « •- - - . II 10 



(Edge 



f i!-dge z - . . . - — 



At 6(3* incl. .| Middle »»--.-- 7 



L Edge >t 



9 

 II 22 



fEdgez . _ . - > o 17 



At 50° incl. ■{ Middle m ..--_ 8 20 



LEdge X - - - . . 13 21 



fEdge z 116 



At 40" incl. i Middle m • ~ - - . 86 



lEdge* .... _ 12 I J 



fEdgez 3 20 



At 30' incl. ■{ Middle m - - - - - 72 



(.Edge a; - . _ . . jj 15 



rEdge z ...._. 4 16 



At 20° incl. ^ Middle w __-., 60 



I Edge Af - - - . - 1 1 1 2 



At 10° incl. ^Middle »? - - - . _ ^ jj 



It is a remarkable circumftance, that the effeft of the fluid at z iricreafed regularly as the 

 angle decreafed ; for though I did not meafure the negative efFe£ts, I could plainly per- 

 ceive that that was the cafe ; whereas the efFedls at m and .v increafed to about the middle 

 of the quadrant, and then decreafed. At 10° the obliquity was fuch, that the fe£tion of the 

 ftream extended very nearly from one fide of the lever to the other. 



As it appears by experiment that the velocity of the fluid flowing out of the veflel was 

 equal to the velocity which a body acquires in falling down the altitude of the fluid above 

 the orifice, the fquare of the velocity mufl be in proportion to that altitude. To find,, 

 therefore, in this cafe whether the refiftance varied as the fquare of the velocity, I let the 

 water flow perpendicularly againfl the plane (Fig. i.) at different depths, and I always 

 found the refiftances to be in proportion to the depth, and therefore in proportion to the 

 ■fquare of the velocity, agreeing with what takes place when the body moves in the fluid. 



M 



