— 228 — — 
WOODEN BEAMS. 
Safe Load, Uniformly Distributed, for Rectangular White or Yellow 
Pine Beams one inch thick, 
allowing 1200 lbs. per square inch fiber strain. 
To obtain the safe load for any thickness, multiply tlie safe load given in 
table, by the thickness of beam. 
To obtain the required thickness for any load, divide by tlie safe load for 
one inch, given in taole. 
Span in 
Feet. 
DEPTH OF 
BEAM. 
6" 
r 
9 " 
10" 
11 " 
12 r 
ず 
14" 
i 5 " 
16" 
Feet. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs. 
Lbs 
5 
960 
1310 
1710 
2160 
2670 
3230 
3840 
4510 
5230 
6coo 
6830 
6 
800 
1090 
14*20 
1800 
2220 
2690 
3200 
3760 
4360 
5000 
5690 
7 
690 
950 
1*220 
1540 
1900 
2}CO 
274 。 
32*20 
3730 
4290 
4880 
8 
600 
8-20 
1070 
リ 5 〇 
1670 
1010 
1400 
2S20 
3270 
3750 
4270 
9 
530 
730 
95O 
1200 
1 4 さ 0 
1790 
2130 
2500 
2900 
3330 
3790 
JO 
480 
650 
85O 
1080 
1330 
1610 
19-20 
2250 
2610 
5000 
3410 
ii 
440 
59 。 
780 
980 
1210 
1470 
1750 
2050 
2380 
2750 
3 100 
12 
400 
540 
7IO 
900 
1110 
1340 
1600 
1880 
2180 
a 500 
2840 
13 
370 
500 
660 
830 
1030 
1240 
1480 
1730 
2010 
•2310 
2630 
H 
34 。 
470 
610 
770 
95 〇 
1150 
1370 
1610 
1870 
2140 
2440 
15 
320 
440 
570 
720 
890 
1080 
1280 
1500 
1740 
2000 
2280 
16 
300 
410 
530 
680 
830 
1010 
1200 
1410 
1630 
1880 
2130 
17 
280 
380 
500 
640 
7 含。 
950 
1130 
リ 30 
1540 
1760 
2010 
18 
270 
360 
470 
600 
74 〇 
900 
1070 
1250 
1450 
1670 
1900 
19 
•250 
340 
450 
57 。 
7 〇〇 
850 
1010 
1190 
1380 
15^0 
1800 
20 
240 
Wo 
450 
540 
6 ア〇 
810 
960 
1130 
1310 
1500 
1710 
2T 
230 
310 
410 
510 
630 
770 
910 
1070 
1240 
1430 
1630 
22 
220 
300 
390 
490 
6io 
730 
870 
1020 
1190 
1360 
1550 
210 
280 
370 
470 
580 
700 
850 
980 
1140 
1300 
1480 
24 
200 
270 
360 
450 
560 
670 
800 
94 。 
1090 
1250 
1420 
25 
I90 
260 
• 今 40 
450 
530 
650 
770 
900 
1050 
1200 
1370 
26 
180- 
250 
33 〇 
420 
510 
620 
740 
870 
1010 
1150 
1310 
27 
180 
240 
10.0 
400 
500 
600 
710 
8 jo 
970 
1110 
1260 
28 
170 
23c 
300 
390 
480 
580 
690 
800 
939 
1070 
mo 
29 
170 
230 
^ 9 〇 
370 
460 
560 
660 
780 
900 
1030 
1180 
Tlie posts for the upper falsework should rest on the caps of the lower falsewo 1 ^ 
a few inches inside of tlie trusses : they should bo attached by splice timbers 
cleats. The height of the upper falsework should be such that tlie upper surface 
tlie cap will be at least six inches below tlie under sides of tlie top chord section 日， 玲 0 
as to permit of the use of cambre blocks between. 
The author would recommend that the encl bents of upper falsework be made till* 00 
or four feet higher than the others», and the use of four posts there instead of two, one ⑽ 
tlie inside and one on the outside of each truss, in order to aid in raising and retaini 11 ® 
in place tlie heavy batter braces. After the latter are put in position a lioi.izoü ⑽ 1 
timber may be firmly bolfced to tlie bent at the level of the other bent caps for 山 ö 
temporary flooring to rest upon. Stout beams stretching from bent to bent will 
