132 
MISCELLANEOUS TABLES. 
TABLE III. 
By which may be determined the depths of Ceiling Joists, Rafters, 
Floor Joists, &c. ; the breadth being li inches, and the deflec- 
tion 4% of an inch to the foot, when uniformly loaded with the 
weights in this table. 
WEIGHT IN 
POUNDS UPON EACH FOOT 
IN LENGTH. 
Length 
in feet, 
clear 
bearing 
15-62 
20-79 
27^00 
34-32 
42-87 
52^73 
64-00 
76^76 
91-12 
107-17 
DEPTH IN INCHES. 
1 
2 
3 
4 
5 
•39 
•79 
M8 
1-58 
1-97 
•43 
•87 
1-30 
1-73 
2^17 
•47 
•95 
1-42 
1- 89 
2- 36 
•51 
1-02 
1- 54 
2- 05 
2-56 
•55 
MO 
P65 
2-21 
2-76 
•59 
M8 
1- 77 
2- 36 
2-95 
•63 
1-26 
1- 89 
2- 52 
315 
•67 
1- 34 
2- 01 
2^68 
3- 35 
•71 
1- 42 
2^13 
2- 84 
3- 55 
•75 
1- 50 
2- 25 
2- 99 
3- 74 
*6 
7 
8 
9 
10 
2-36 
2- 76 
3- 15 
3-55 
3-94 
2^60 
3^03 
3^47 
3^90 
4-33 
2- 84 
3- 31 
3-78 
4^25 
4^73 
3-07 
3- 58 
4- 10 
4^61 
5- 12 
"3¥r 
3- 86 
4- 41 
4- 96 
5- 52 
3- 55 
4- 14 
4^73 
5- 32 
5-91 
4- 41 
5- 04 
5- 67 
6- 30 
4-02 
4- 69 
5- 36 
6^03 
6- 70 
4-25 
4^96 
5^67 
6-38 
7^09 
4^49 
5-24 
5- 99 
6- 74 
7- 49 
11 
12 
13 
14 
15 
4^33 
4- 73 
5^12 
6^52 
5- 91 
4- 77 
5- 20 
5^63 
6- 07 
6^50 
"sYo" 
6-67 
6-15 
6- 62 
7- 09 
5^63 
6^15 
6^66 
7-17 
7-68 
~6-07 
6- 62 
7- 17 
7-72 
8^27 
~6-50" 
7-09 
7- 68 
8- 27 
8-86 
6-93 
7^56 
8^19 
8- 82 
9- 45 
T37" 
8-04 
8-71 
9^38 
10^05 
7- 80 
8- 51 
9- 22 
9-93 
10-64 
8-23 
8- 98 
9- 73 
10-48 
11^23 
16 
17 
18 
19 
20 
6-30 
6-70 
7^09 
I 7-49 
1 7-88 
~6¥3" 
7^37 
7- 80 
8- 23 
8-67 
7- 56 
8- 04 
8-51 
8- 98 
9- 45 
8-19 
8- 71 
9- 22 
9-73 
10^24 
8- 82 
9- 38 
9-93 
10-48 
iro3 
9-45 
10-05 
10- 64 
11- 23 
11-82 
10-09 
10- 72 
11- 35 
ir98 
12^61 
10^72 
11^39 
12^05 
12^72 
13^39 
11- 35 
1205 
12- 76 
13- 47 
14- 18 
11-98 
12^72 
13^47 
14-22 
14-97 
Multipliers to give the breaking weight of every Scantliug in each column respectively. 
13-34 
12-13 
11-12 
10-26 
9-53 
8-90 
8^34 
7^85 
7-41 
7^02 
* Example. — If the weight upon a ceiling joist 6 feet long, 3-07 in. by Ij in., be 34-32 
lbs. to the foot, the deflection in the middle is of an inch ; with one-half of that weight, 
or I7-I6 lbs. to the foot, the deflection is -^-^ or of an inch; with one-third of the same 
weight, or 11-44 ffis. to the foot, the deflection is or of an inch ; and so on, the de- 
flection varying according as the weight. 
The breaking weight of a Red Pine ceiliug joist 6 feet long, 3-07 in. by li in., is 6 k 
34-82 X 10-26 = 2112 lbs. uniformly loaded, or 1056 lbs. suspended from the middle. 
The weight of a superficial foot of laths and hair mortar, may be estimated at 8 or 10 tbs. 
