i8 Experiments made at Greenland Dock. [Jan. 



64. The same as the preceding ; but for the immersed parallelo- 

 pipedon was substituted a plank 21 feet 3 inches long, 1 foot thick, 

 and 3 inches broad, standing in a perpendicular direction : 



Velocity per second, 12 f. Motive weight, 137"41 lbs. 



65. The same as the preceding, but the length of the plank 

 reduced to 1 foot 3 inches : 



Velocity per second, 12 f. Motive weiglit, 11 5*02 lbs. 



66. Conductor with a round iron bar immersed 5 feet 6 inches 

 (fig. 9). Length of a z, 23 feet 10 inches. Breadth, a a or z z, 

 1 foot. DeptI), X y, 1 foot. Slant, ayovzy, 6 feet ; 



Velocity per second, 12 f. Motive weight, 90061 lbs. 



67. Same as the preceding, with a wooden triangle attached to 

 the bottom of the round iron bar. Centre of the triangle im- 

 mersed, 6 feet. Apex foremost. Base of the triangle, 1 foot. 

 Length of a side, 3 feet. Thickness, 1 foot : 



Velocity per second, 12 f. Motive weight, 137 52 lbs. 



68. Saine as the preceding, l)ut the base of the triangle foremost : 

 Velocity j)er second, 12 f. Motive weight, 2'tr29 lbs. 



69. Same as the preceding, a cube being substituted for the 

 triangle, each face of the cube a square foot : 



Velocity per second, 12 f. Motive weight, 2.57"70 lbs. 



70. Same as the preceding, a thin square iron plane being sub- 

 stituted for the cube. Area of the plane, 1 foot square : 



Velocity per second, 12 f. Motive weight, 2i726 lbs. 



71. Same as the preceding, a round iron plane, with an area of 

 a foot square, being substituted for the square plane. Diameter, 

 13-5-t inches : 



Velocity per second, 12 f. Motive weight, 24'3'97 lbs. 



72. Same as the preceding, a cylinder, u (fig. 10), being sub- 

 stituted for the circular plate. Length of the cylinder, 1 foot. 

 Area, 1 foot. Diameter, 13 Si inches : 



Velocity per second, 12 f. Motive weight, 238"S0 lbs. 



73. Same as the preceding, with a semiglobe fixed to the hind- 

 most end of the cylinder : 



Velocity per second, 12 f. Motive weight, 219'88 lbs. 



74. Same as the preceding, the semiglobe being fixed to the 

 foremost end of the cylinder : 



Velocity per second, 12 f. Motive weight, 131-70 lbs. 

 7'. Same as the preceding, with a semiglobe at both ends of the 

 cylinder : 



Velocity per second, 12 f. Motive weight, 130'69 lbs. 



76. Same as the preceding, witli a globe, tiie diameter of wlilch 

 is 13"54 indies, substituted for the cylinder : 



Velocity per second, 12 f. Motive weight, 140*04 lbs. 



77. A new conductor, (lig. 11, plate XVI.) with a broad bar im- 

 mersed 5 feet 6 inches. Length of conductor at toji, a z, 28 feet 

 10 inches. Breadth at top, 3 feet 4 inclies. Length at bottom, 

 2/ y, 14 feet. Breadth at bottom, < c, 1 foot. Slant, a y, 6 feet. 



