OF ARTS AND SCIENCES. 



321 



Time in 

 Seconds. 



Velocity per 

 Second. 



31.0 

 30.0 

 27.0 



36.5 



32.5 



Feet. 



1.56 



1.51 



0.981 



'•'■ Exp. 29. Same block ; upper surface horizontal ; 

 a square plate, 2 inches by the side, on that side which 

 is next the blast, ....... 34.0 



" Exp. 30. Conical tube, open at both extremities ; 

 diameter of larger opening 2 inches ; of lesser ex- 

 tremity 1.3 inches; length 4 inches; inclination of 

 sides 5° ; centre of lateral opening 1.6 inches from 

 lesser extremity ; lesser extremity turned towards the 

 blast, ......... 35.0 



" Same conical tube ; lesser opening reduced to 

 .37 inch, ........ 54.0 



" Exp. 31. Conical tube, open at both extremities; 

 diameter of larger 3 inches ; of lesser 1.2-5 inches ; 

 inclination of sides 15° ; length 7 inches ; centre of 

 lateral opening 1.7 inches from lesser end ; lesser end 

 towards the blast, ....... 



" Exp. 32. Same conical tube, its sides continued 

 until they form a cone, with its apex turned toward 

 the blast, ........ 



" Same, with its axis making, horizontally, an an- 

 gle of 35° with the direction of the blast, 



" Same ; axis making an angle of 15° with the blast, 



" Exp. 33. Conical tube ; angle of sides 47°, open 

 at both extremities ; diameter of larger extremity 4 

 inches, of lesser 1.4 inches ; length 3.3 inches; cen- 

 tre of lateral opening from lesser end 1.1 inches, 



" Same tube ; sides prolonged, forming a cone ; 

 apex towards the blast, ...... 



Fig. 12. Fig. 13. 



" Exp. 34. Conical tube ; 

 inclination of sides 90° ; larger 

 end 4 inches, lesser 1.25 ; 

 height 1.3 inches (fig. 12), . 28.5 1.86 



" Same ; sides prolonged, 

 forming a cone ; apex to the 

 blast (fig. 13), . . . 34.0 1.56 

 41 



28.4 1.87 



51.0 1.039 



1.71 

 1.77 

 1.96 



1.45 

 1.63 



