C<v 
244 
OF THE PARTS OF 
[sect. VII. 
512. The teeth of wheels will be most conveniently given in a tabular form, 
with a correction for curvature in determining their breadth, which is not in 
cluded in the formula in my treatise on cast iron. The first column shows the 
stress on the teeth in lbs.; the second, the horse power nearly equivalent, 
when the velocity is three feet per second; the third column, the pitch ; the fourth, 
the thickness; and the fifth, the breadth of the teeth : the sixth column shows the 
greatest depth of the middle of the arm at the base in the direction of the wheels’ 
motion, when that part is one-third of the breadth of the teeth, and the radius is 
one foot; hence, being multiplied by the square root of any other radius in feet, 
it will be the depth for it; the seventh column shows the breadth of the rib which 
strengthens the arm; and the eighth, the diameter of a cylinder, when the force 
of the steam is thirty-five inches of mercury in the boiler, and the teeth move at 
the same velocity as the piston. For any other velocity the stress will be founds/ 
by art. 500. 
513. A Table of the Strength, &c. of Teeth and Arms 
for Wheel Work. 
I C I 7 
Stress 
in lbs. 
Horse power 
at 3 feet per 
second. 
Teeth of Wheels. 
Wheel with 6 arms. 
Diameter of 
the cylinder for 
low pressure 
steam,—teeth 
moving at the 
same velocity 
as the piston,— 
in inches. 
Pitch 
in inches. 
Thickness 
in inches. 
Breadth 
in inches. 
Depth of arm 
for 1 foot ra 
dius, in inches. 
L 
Breadth of rib 
in inches. 
C‘ 
22 
0-25 
0-25 
0-119 
0-75 
0-87 
0-25 
2-0 
85 
0-5 
0-50 
0-238 
1-25 
1-24 
0-42 
3-7 
191 
1 
0-75 
0-357 
1-75 
1-67 
0-60 
5-5 
337 
2 
1-00 
0-475 
2-50 
1-76 
0-80 
7-4 
520 
3 
1-25 
0-590 
3-00 
2-00 
1-00 
9-2 
800 
4 
1-50 
0-730 
4-00 
2-20 
1-30 
11-3 
1040 
5 
1-75 
0-835 
4-25 
2-40 4 
1-40 
12-9 
1370 
7 
2-00 
0-955 
5-00 
2-50 
1-70 
14-8 
1720 
9 
2-25 
1-070 
5-50 
2-70 
1-80 
16-6 
2100 
10*5 
2-50 
1-190 
6-00 
2-85 
2-00 
18-4 
2560 
13 
2-75 
1-310 
6-75 
300 
2-20 
20-3 
3000 
15 
3-00 
1-430 
7-25 
3-20 
2-40 
22-2 
3600 
18 
3-25 
1-550 
8-00 
3-30 
2-60 
24-0 
4150 
21 
3-50 
1-670 
8-50 
3-40 
2-80 
26-0 
4800 
24' 
3-75 
1-790 
9-25 
3-50 
2-90 
28-0 
5700 
27-5 
4-00 
1-910 
10-25 
3-60 
3-40 
29-5 
6300 
31-5 
4-25 
2-025 
10-50 
3-70 
3-50 
31-5 
6900 
34-5 
4-50 
2-150 
11-00 
3-80 
3-70 
33-3 
7700 
38-5 
4-75 
2-270 
11-75 
3-90 
3-90 
35-0 
8500 
42-5 
5-00 
2-390 
12-25 
4-00 
4-00 
37-0