[ H 4 - ] 
Table III. Containing 'Nineteen Setts of Experiments on Windmill-Sails 
of various Struclures } Pojitions , and Quantities of Surfaces. 
The kind of fails 
made ufe of. 
0 * 
z 
Angle at the 
extremities. 
j Created angle. 
Turns of the 
fails unloaded. 
Turns of ditto 
at the maxim" 1 . 
1 Load at the 
maximum. 
l 
Created load. 
Produdl. 
Quantity of 
furface. 
Ratio of greateft ve- 
[ locity to the velocity 
| at a maximum. 
Ratio of greateft 
load to the load at 
maximum. 
Ratio of furface 
to the produdl. 
Plain fails at an C 
0 
O 
lb. 
lb. 
Sy. In 
angle of 55 0 . ( 
1 
35 
35 
66 
4 2 
7 > 5 & 
12,59 
318 
404 
10:7 
10:6 
10:7,9 
Plain fails weather’d C 
2 
1 2 
1 2 
70 
6 >3 
7,56 
44 1 
404 
10 : 8,3 
10 : 10,1 
according to the< 
3 
*5 
1 £ 
io 5 
69 
6,72 
8,i 2 
464 
404 
1 0 : 6,6 
10:8,3 
10: 10,15 
common practice. £ 
4 
18 
1 8 
96 
66 
7 .o 
9.81 
462 
404 
10: 7, 
10:7,1 
10: ro,i5 
Weathered accord- C 
5 
9 
z6[ 
66 
7 .o 
462 
404 
10 : 1 1,4 
ing to Maclauririt s 
6 
1 2 
29 
7 °i 
7.35 
518 
404 
10: 12,8 
theorem. £ 
7 
*5 
3 2 2 
631 
8,3 
5 2 7 
404 
10: 13, 
~r 
8 
0 
*5 
1 20 
93 
4-75 
5 . 3 1 
442 
404 
10:7,7 
10 : 8,9 
10:11, 
Sails weathered in 1 
9 
3 
18 
120 
79 
7 ,o 
8. > 2 
553 
404 
10:6,6 
io: 8,6 
0:13,7 
the Dutch man- J 
10 
5 
20 
78 
7.5 
8,12 
585 
4°4 
10 : 9,2 
io; 14,5 
ner, tried in va- j 
1 1 
7 i 
2 2 1 
113 
77 
8,3 
9,81 
6 39 
404 
10 : 6,8 
to :8,5 
10: 15,8 
rious pofitions. 
1 2 
10 
2 5 
108 
73 
8,69 
10,37 
6 34 
404 
10 : 6,8 
10 : 8,4 
10: 15,7 
L 
*3 
1 2 
2 7 
100 
66 
8,41 
10,94 
580 
404 
10 : 6,6 
10:7,7 
IO : 14,4 
Sails weathered in f 
the Dutch manner, \ 
14 
7z 
22 l 
123 
75 
10,65 
12,59 
799 
5°5 
1 0 : 6, 1 
10: 8,5 
'0 : 1 5,8 
1 5 
10 
2 5 
1 17 
74 
1 1,08 
13,69 
820 
5°5 
10:6,3 
10:8,1 
IO : 16,2 
wards the extremi- / 
16 
1 2 
27 
« *4 
66 
1 2,09 
* 4,231 
799 
505 
10:5,8 
10 : 8,4 
10:15,8 
ties. L 
'7 
*5 
30 
96 
63 
1 2,09 
14,78 
762 
5°5 
10 : 6,6 
10 :8,2 
IO : 15,1 
8 fails being feftors f 
nf ellipje 1 in their < 
18 
1 2 
22 
105 
6 4 i 
16,42 
Ni | 
OO 
^3 | 
1059 
854 
10 : 6, 1 
10:5,9 
IO : I 2,4 
bell pofitions. £ 
*9 
1 2 
22 
99 
6 4 i 
1 8,06 
1165 
1 146 
10:5,9 
I O : 1 0, 1 
1. 
2. 
3 - 
4 - 
5 - 
6. 
7 - 
8. 
9 - 
IO. j 
1 1. 
I 2. 
Obfervations 
