MISCELLANEOUS TABLES. 
141 
TABLE VII. Continued. 
By which may be determined the depths of Rafters, Floor Joists, 
Bridging Joists, Binding Joists, &c.; the breadth being 2i inches, 
and the deflection of an inch to the foot, when uniformly loaded 
with the weights in this table. 
WEIGHT IN POUNDS UPON EACH FOOT IN LENGTH. 
Length 
clear 
bearing. 
166-3 
1901 
216-0 
244-1 
274-6 
307-5 
343-0 
381-0 
421-8 
465-4 
DEPTH IN INCHES. 
1 
2 
3 
4 
5 
•73 
1- 46 
2- 19 
2- 92 
3- 65 
•76 
1- 53 
2- 29 
3- 06 
3-82 
-80 
1- 59 
2- 39 
3- 19 
3-99 
-83 
1- 66 
2- 49 
3- 32 
4- 15 
-86 
1- 73 
2- 59 
3- 46 
4- 32 
•90 
1^79 
2- 69 
3- 59 
4- 49 
-93 
1- 86 
2- 79 
3- 72 
4- 65 
-96 
1- 93 
2- 89 
3- 85 
4- 82 
1-00 
1- 99 
2- 99 
3- 99 
4- 98 
1- 03 
2- 06 
3- 09 
4- 12 
5*15 
6 
7 
*8 
9 
10 
4- 39 
5- 12 
5- 85 
6- 58 
7- 31 
4- 59 
5- 35 
6- 11 
6- 88 
7- 64 
4- 78 
5- 58 
6- 38 
7- 18 
7-97 
~4^ 
5- 81 
6- 65 
7- 48 
8- 31 
5- 18 
6- 05 
6- 91 
7- 77 
8- 64 
5- 38 
6- 28 
7- 18 
8- 07 
8-97 
5- 58 
6- 51 
7- 44 
8- 37 
9- 30 
6-78 
6- 74 
7- 71 
8- 67 
9- 64 
5- 98 
6- 98 
7- 97 
8- 97 
9- 97 
6-18 
721 
8- 24 
9- 27 
10-30 
11 
12 
13 
14 
15 
8-04 
8- 77 
9- 50 
10-23 
10-96 
"s-ir 
9-17 
9-93 
10- 70 
11- 46 
8- 77 
9- 57 
10- 37 
11- 16 
11-96 
9-14 
9-97 
10- 80 
11- 63 
12- 46 
9-50 
10- 37 
11- 23 
12- 09 
12-96 
9-87 
10- 76 
11- 66 
12- 56 
13- 46 
10- 23 
11- 16 
12- 09 
13- 02 
13-95 
10- 60 
11- 56 
12- 53 
13- 49 
14- 45 
10- 96 
11- 96 
12- 96 
13- 95 
14- 95 
11- 33 
12- 36 
13- 39 
14- 42 
15- 45 
16 
17 
18 
19 
20 
11- 70 
12- 43 
13- 16 
13- 89 
14- 62 
12-23 
12- 99 
13- 76 
14- 52 
15- 28 
12- 76 
13- 56 
14- 35 
15- 15 
15-95 
13- 29 
14- 12 
14- 95 
15- 78 
13- 82 
14- 69 
15^55 
14- 35 
15- 25 
14- 88 
15- 82 
15-95 
Multipliers i 
0 give the breaking weight of every Scautliug ia each column respectively. 
7-19 
6-88 
6-59 
6-33 
6-08 
5-86 
5-65 
5-45 
5-27 
5-10 
* Example. — A joist 8 feet long, 6'91 in. by 2^ in., with 274'6 lbs. weight to the foot, 
uniformly loaded, deflects in the middle Jt^ of an inch ; with the same weight, 6'91 in. by 
2| in. deflects -^^ of an inch; 6'91 in. by 3 in. deflects of an inch ; and the breaking 
weight of Red Pine 8 feet long, 6"91 in. by 2^ iu., is 6-08 times the tabular weight. 
By Table I., page 125, the breadth of a Red Pine beam, 14 inches deep and 16 feet long in 
the clear, which \r{[\just break with 20 cwts. to the foot, is 20 x -1633 = 3-266 inches ; and if 
one-fourth of the breaking weight be the greatest weight' with which a beam ought to be 
loaded, the breadth of the beam should be 4 x 3'266 = 13"064 inches. 
Therefore, upon the data in this and the preceding page, the scantlings are, — joists 7 x 2J; 
beams 14 x 13, or if mortised for the joisis, say 14 x 14. By Table II., page 129, the de- 
flection of each beam is -GOl, or 3. of an inch. 
T 
