XXvi EXAMPLES TO THE SECOND SERIES. 
Greatest weight upon the floor, 3 cwts. per superficial foot. 
Breaking weight of the joists, 6 times the weight upon the floor. 
3 X 15 X 8 
The weight upon each joist is — = 30 cwts. 
The breaking weight of each joist is 6 X 30 = 180 cwts. 
If the joists be Red Pine, then Col. II. p. 50 ; c = -125 = J ; 
180 
And — -— = 22-50 cwts.; the tabular weight. 
By the Second Series of Tables, the following are the scantlings and 
weights for 8 feet long : — 
Scantlings of the 
Joists. 
Tabular Weights. 
Notes. 
Table VIII.... 
8X3 
24-00 cwts. 
8i X 2i 
25-78 " 
30 X 1-289 = 25-78 
" IX. ... 
9 X 2i 
22-78 ,/ 
9i X 2 
22-56 « 
20-25 X 1-114 = 22-56 
Data for the Beams. 
Beams 15 feet long and 9 feet apart from middle to middle. 
Greatest weight upon each beam, 9 X 3 X 15 = 405 cwts. 
Breaking weight of the beams, 4 times the weight upon the floor. 
The breaking weight of each beam is 4 X 405 = 1620 cwts. 
If the timber be sound Memel, then Col. II. p. 50; c = -097 ; 
and 1620 X -097 = 157-14 cwts. ; the tabular weight. 
By the Second Series of Tables, the following are the Scantlings and 
Weights for 15 feet long: — 
Scantlings of the 
Beams. 
Tabular Weights. 
Notes. 
Table XIII. . 
13 
X 
14* 
157-73 cwts. 
// II 
m 
X 
164-02 " 
152-10 X 
1-0784 
= 16402 
« XIV. . 
14 
X 
12 
156-80 " 
// // 
14i 
X 
Ui 
161-18 " 
150-26 X 
1-7027 
= 161-18 
XV. . 
15 
X 
m 
157-50 " 
150 + 
2 
165 
157-50 
