. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 45 find the breaking load of a square beam having a thickness equal to the diameter of the log and multiply this result by the decimal .589. 78. Breaking- Load of Rafters.—In finding the breaking load of timbers j^laced in any'oblique position as show in Fig. 21, take the length of the rafter equal to the horizontal span AC and proceed as in 76 and 77 79. Table of Safe Quiescent Center Loads for Hor- izontal Beams of White Pine Supported at Both Ends.— In this table the safe load is taken at one-sixth
. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 45 find the breaking load of a square beam having a thickness equal to the diameter of the log and multiply this result by the decimal .589. 78. Breaking- Load of Rafters.—In finding the breaking load of timbers j^laced in any'oblique position as show in Fig. 21, take the length of the rafter equal to the horizontal span AC and proceed as in 76 and 77 79. Table of Safe Quiescent Center Loads for Hor- izontal Beams of White Pine Supported at Both Ends.— In this table the safe load is taken at one-sixth of the theoretical breaking load. This large reduction is made necessary on account of the cross-grain of timbers and joists and the large knots which weaken very materi- ally the pieces. Where a judicious selection is made in placing the joists, lay- ing the inherently weak pieces in places where little strain can come upon them, much sav- ing of lumber may be 03 a o Span 10 feet. ! Span 12 feet. Span 11 feet. Span 16 feet. K Breadth. Breadth. Breadth. Breadth. Eh a, Q 2 in 4 in. 6 in. 2 in. 4 in. 6 in, 2 in. 4 in. 1 6 in. 2 in. 4 in. 6 in. 4 6 8 10 12 240 540 960 1500 2160 lb.: I 10 in 13 in 4 6 8 10 12 lbs 960 2'60 38401 6000| 8640 lbs. 1200 2700 4800 7500 10800 lbs. 800 1800 3200 5000; 7200 lbs. 1(X)0 2250 4000 6250 9000 lbs. 1200 2700 4800 7500 10800 lbs. 688 1544 2744 4288 6176 860 1930 3430 5360 7720 lbs 1032 2316 4116 6432 9264 lbs. 750 1680 3000 4680 6750 lbs. 900 2016 3600 5616 8100. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original King, F[ranklin] H[iram], 1848- [from old catalog]. [Madison, Wis. ] State journal printing company
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Keywords: ., bookcentury1800, bookcontributorthe, bookdecade1890, bookyear1891
