TIMBER PHYSICS VARIATION IK STRENGTH. 



371 



Strength of contiguous blocks of the same scantling, select material, in compression endioise. 



[Dimensions generally, 2.76 by 2.76 by 2.76 inclies.] 



Xumber ol blo< Ivs. 



3 

 2 



3 



4 



5 



6 



7 



8 



9 



10 



13 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



28 



29 



30 



31 



32 



33 



34 



35 



36 



37 



38 



39 



40, 



41 



42 



43 



4o! 



46 



47. 



48 



49, 



50. 



51. 



52. 



53. 



54. 



55 



56 



57. 



58 



59. 



60. 



Kind of wood. 



"White 



pine (8 



per ( cut 



11101s 



ture). 



Longleaf 



pine (8 



per cent 



mois- 



tuie). 



4, 850 

 4,800 

 4 690 

 4, 840 

 4,760 

 4,720 

 4, 730 

 4, 760 

 4,750 

 4, 770 

 4, 730 

 4, 760 

 4,770 

 4,670 

 4, 600 

 4,660 

 4, 500 

 4,600 

 4,610 

 4,880 

 4, 920 

 4,870 

 4, 970 

 4, 940 



5,070 



4, 940 



5, 020 

 5, 110 

 5, 020 

 4,950 

 4,820 



4, 950 

 4,900 



5, 040 

 5, 160 

 5, 120 

 5, 100 

 5, 230 

 5,280 

 5,260 

 5,280 

 5, 300 

 5, 310 

 5, 300 

 5,350 

 5, 400 

 5.360 

 5, 360 

 5,510 

 5,070 

 5,150 

 5,020 

 4,770 

 4,770 

 4, 920 

 4, 950 

 4, 840 

 4, 860 



a 6, 400 



11, 580 

 11,5,0 



11, .no 



11, 060 

 8, 250 

 10,740 

 11,180 

 11, 220 



10, 980 

 31,130 

 11, 510 

 11 , 490 

 11, 320 

 11, 220 

 11,320 

 11,340 

 11,470 

 10, 700 

 10, 740 

 11, 030 

 13,110 



11, 450 



12, 250 

 12, 760 

 10, 740 

 10, 350 

 10, 280 

 10, 150 



9,860 

 10, 000 

 10, 120 

 10, 370 

 10, 320 

 10, 250 

 10, 400 

 10, 050 

 10, 050 

 10, 350 

 10, 100 

 10, 030 

 9, 970 

 9,880 

 10, 050 

 10, 220 

 10, 470 

 10, 860 

 10, 590 

 10, 350 

 11,150 

 10, 970 

 30,890 

 10, 790 



10, 970 



11, 040 

 10, 940 

 10, 970 

 10, 840 

 10 710 

 10, 890 

 10, 710 



Loblolly 



pine 

 (125~{ per 

 cent 

 mois- 

 ture) . 



Cypress (125 fper 

 cent moisture). 



Tulip* 



tree (8 

 per cent 

 mois- 

 ture). 



Pounds per square incli 



9 



2. 



9 



9 



*^ 



a 5, 

 2 

 2 

 2, 

 2, 



a 6, 

 9 



<^, 



2 



2, 



« 5, 



2, 

 2, 

 2, 

 o 



flO, 



2, 

 2, 

 2, 



A, 



a7, 



2, 



9 



«, 



9 



«7, 



9 



<■<> 



a 5, 



2, 

 ') 



«i 



2, 



9 

 **» 



a 5, 

 2, 

 2, 

 2, 

 2, 



a 6, 



2, 



2, 

 2, 



a 6, 

 ii, 

 <£, 

 2, 

 2, 



a 6, 

 2, 

 2, 

 2, 

 2, 



a 7, 



330 

 380 

 380 

 450 

 700 

 600 

 680 

 640 

 720 

 970 

 770 

 7 »0 

 7h0 

 800 

 840 

 8S0 

 870 

 870 

 860 

 480 

 760 

 700 

 720 

 640 

 050 

 680 

 650 

 650 

 780 

 320 

 730 

 780 

 720 

 600 

 360 

 610 

 560 

 5S0 

 584) 

 220 

 620 

 600 

 640 

 010 

 440 

 620 

 620 

 600 

 680 



ttxU 



710 

 750 

 760 

 720 

 850 

 710 

 6fe0 

 600 

 600 

 030 



2, 720 

 2, 700 

 2. 720 

 2,680 

 2,680 

 2. 720 

 2,770 

 2, 820 

 2, 870 



3, 020 

 3, 070 

 3,099 

 3,120 

 3,170 

 3,140 

 3, 090 



3, 120 



3, 170 

 3, 220 

 3, 270 

 3, 320 

 3, 270 



3, 320 

 3, 370 

 3, 420 



3, 490 

 3, 520 

 3, 570 

 3, 620 

 3, 040 



4,170 

 4, 190 

 4,170 

 4,380 

 4, 200 

 4,180 

 4, 230 



4,230 

 4,380 

 4,130 

 4,160 

 4, 360 

 4, 100 

 4,110 

 4,090 

 4,070 



5,740 

 5, 700 

 5,770 

 5, 700 

 5,430 

 5, 430 

 5,420 

 5,560 

 5,440 

 a 7, 070 

 5, 770 

 6,030 

 6,170 

 5, 840 

 5,440 

 5, 360 



5, 530 

 5,530 

 a 6, 880 

 5, 920 

 5, 930 

 5,770* 



5, 780 

 6, 120 

 6,480 

 6,310 



6, 220 

 6, 310 



a 7, 420 

 6, 340 

 6, 360 

 6,040 



6, 280 

 6, 490 

 6,610 

 6, 220 

 6, 190 

 a 7, 300 

 6,010 

 6, 140 

 0, 170 

 6, 010 

 6, 490 



6,080 

 5,860 

 6,110 



a 7, 920 

 6,210 

 6,270 

 6,300 

 6,420 

 6, 450 

 6,170 

 6,440 

 6, U0 

 6,330 



a 7, 540 



Oak 



(yard 

 dry). 



970 

 370 

 260 

 120 

 120 

 480 

 150 

 500 

 580 



910 

 340 

 870 

 900 

 130 

 380 

 890 

 840 

 480 



030 

 660 

 060 

 740 

 580 

 400 

 710 

 060 



280 

 510 

 510 

 080 

 030 

 790 

 640 

 560 

 780 



a Dried to about 2 per tent moisture before testing. 



As was indicated at the outset and is fully explained in Bulletins 6 and 8, the plan of this 

 investigation also included among the objects to be sought the establishment of the following: 



(1) The relative value of each species. 



(2) The outward signs or physical and structural properties, easily used in inspection. 



(3) The relation of the properties among themselves ) and 



(4) Their relation to the conditions under which the wood is formed, such, for instance, as the 

 age of the tree when wood is laid on, influences of soil, climate, etc. 



As has been explained, some of these relations were more or less fully determined, at leasfy 

 qualitatively; nevertheless, the relation of the several forms of resistance, as well as the mutual 

 relations of the properties in general, seemed to escape observation in the manner of inquiry 

 generally pursued. It became clear before long that these laws must be established by special 

 series, planned each to seek answer to some specific question. Several of these were carried out, 



