Transactions . pieces of white pine, each inches deep inches wide, united by six bolts and 12 flat Fig. 30. { -^. &- !*-X bolts if-i— +|43£ >1«—-4%- Li1 -Clear-span=66-- -tf-i— I 1,1— ?& &—r- Weight Joggled Beam with Straight Wrought-Iron Keys. wrought-iron keys. (See Fig. 30.) Span, 66 inches of beam, 35 pounds. Broke at 7800 pounds. Check-pieces : B weighed 12 pounds, failed at 2450 pounds; C weighed 12 pounds, failed at 2600 pounds. Efficiency of beam, per cent. Fig. 31. *=» Inr -Clear-span=66-— -^-F^S^ Joggled Beam with Straight Wrought-Iron Keys. No. 31. Ever
Transactions . pieces of white pine, each inches deep inches wide, united by six bolts and 12 flat Fig. 30. { -^. &- !*-X bolts if-i— +|43£ >1«—-4%- Li1 -Clear-span=66-- -tf-i— I 1,1— ?& &—r- Weight Joggled Beam with Straight Wrought-Iron Keys. wrought-iron keys. (See Fig. 30.) Span, 66 inches of beam, 35 pounds. Broke at 7800 pounds. Check-pieces : B weighed 12 pounds, failed at 2450 pounds; C weighed 12 pounds, failed at 2600 pounds. Efficiency of beam, per cent. Fig. 31. *=» Inr -Clear-span=66-— -^-F^S^ Joggled Beam with Straight Wrought-Iron Keys. No. 31. Everything exactly as in No. 30, except that beamweighed 40 pounds. Broke at 8200 pounds. Check-pieces:A weighed 16 pounds, broke at 2620 pounds; D weighed 15pounds, broke at 3030 pounds. Efficiency of beam, percent. No. 32. Everything exactly as in No. 30. Beam weighed40 pounds. Broke at 6350 pounds. Check-pieces: B weighed 780 THE EFFICIENCY OF BUILT-UP WOODEN BEAMS. Diagram Beams with ^Square Wrought-Iron Keys. Each horizontal space =>sj Inch deflection. THE EFFICIENCY OF BUILT-UP WOODEN BEAMS. 781 15 pounds, broke at 1800 pounds ; C weighed 15 pounds, brokeat 2200 pounds. Efficiency of beam, per cent. No. 33. Similar to No. 30, except that only 8 keys wereused. (See Fig. 31.) Weight of beam, 37 pounds. Broke at10,750 pounds. Check-pieces: B weighed 15 pounds, broke at3100 pounds; C weighed 17 pounds, broke at 3480 of beam, per cent. [ Fig. 32. i «& i •£•- T M p- jM --•»(t?—! 1 «&—I Joggled Beam with Straight Wrought-Iron Keys ^Square. No. 34. Similar to No. 33. Weight of beam, 35Broke at 7990 pounds. Check-pieces: A weighed 13broke at 2150 pounds; D weighed 14 pounds, brokepounds. Efficiency, per cent. No. 35. Similar to No. 33. Weight of beam, 37Broke at 9270 pounds. Check-pieces +* A weighed 14 L1 pounds,pounds,at 2970 pounds,
Size: 1266px × 1973px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
