AlMUUlilig 111 "I'hnan hiw i. . ,,1 f.,r tin- \\ -hoi" .i| 'i!. 



dc|ih, the m: \iniuiii skin strrsM wi'iild he Hf) I] Ids per s<|. iii. 



Tin- . ii , fncieiit n|' elasticity a- drlerim I by an increment in ih< 



detlcelioiiol' .7.V> in-, lietween the lo.i 1-. 2<)<Ht III.-, anil 1 *,<>llll Ibs . 

 i- 1.!>*!.-|OII 11,.-. 



Table K sliev.s i In- several readings. 



Tin- III . upii-d ll\ till- test wa- .'10 mill" 



'I'lic uvijit ..film IH-.-IIH was I |.~> Ibl >'< <>/.-.. nr "iM.'.IH !lis. JUT cnl.ir 

 fu.il ui i 11,-t. ;',i,|, ami -I:!:! lb>. Ill <>/.-., or 3*.'.i-l Hi-. per cnbi,- t'nut M 

 Nov. ITth. showing a loss of weight in (In- laboratory at the rat<- .it' 

 ."L'.'JT Ihv per ciiliio foot per day. 



Mcam \\'I. This is really Beam XV re-tested, the .eeond [,-! having 

 lic.-n mail.' .HI Dec. 8th, 1893. In tin- tir-t. tf.-l. tin- liram ha.l lailed by 

 orippliog on the .niiiin-.'-sion face; the beam wa.- now irv. rs.'.l, an. I 

 ini.lrr a luatl of -."i, "iso lli-. it f'ailnl by the tearing apart of the fibres 

 "ii the ti'iiM.m face along the .surface at which the crippling had pre- 

 viously taki'ii place. The tensile fracturr extended '_' inelio liolow tin. 

 skin. The jockey weight was now run hack until the lever again 

 floated, iinil the load was gradually increased until it amounted to 

 32,000 His., when the beam fractured a second time on t lie tension side 

 the fViirtuiv extending to a depth of 5 inches below the skin. The firs* 

 fracture was accompanied by a loujiitudinal opening (as in Fig.) about 

 lid inelie- in .xtent. A second longitudinal opening, also about <>(> 

 inches long, occurred at the second fracture. 



The maximum skin stress corresponding to the breaking load of 

 25,580 Ibs. is 5-i(iG Ibs. per square inch. 



The co-efficient of elasticity, as determined by an increment in the 

 deflection of .54 ins. between the Ion Js of 1.000 Ibs. and 11 ,500 Ibs., 

 was 1,825,450 Ibs. 



Table E gives the several readings. 



The weight of the beam was reduced to 428 Ibs., or 38.40 Ibs. per 

 cubic foot, showing a loss between the test ..n Nov. 17th, and that on 

 Dec. 8th, at the rate of .0247*5 His. per cubic foot per day. 



Beams XVII to XXI were sent to the totting laboratories by the 

 British Columbia Mills Timber iV Trading Company through Mr. 

 C. M. Beccher. The whole of these timbers were cut on the coa- 

 tion of British Columbia. The trees from which Beams X VII, XVIII. 

 XX and XXI were cut, were felled during the summer of 1 >!':. and 

 came from Hartney's Camp, Seymour Creek, while Beam XIX was 

 cut from a tree felled in the spring of ISjVi. an.l came from liowliiiL''.- 

 Camp, Salmon Arm. 



Beam XVII was tested June :Mlh, 1S94. This beam wa.- e.iar-e 

 grained, the. grain running very nearly parallel with the axis, and it 

 contained a number of small knots on the compression side. It wa> 

 cut from the heart of the tree, and \v;i- tested with the annular rini;- 

 as in l-'iir. -- . 



right 



f/'f.ii. centre 



front riert\*ff"-f*iT 



Under a load of 4S,i;00 Ibs. il , the tearing apart <!' tin lilir. .- 



on the tension face, the corn spomlin^ maximum skin stres>, neuicctiirj 

 the compression of the timber, being 4!MI>; Ibs. ] r -.|U;uv inch. Tin- 

 tensile fracture was followed immediately by a longitudinal shear, coin 

 cident with the neutral plane at the centre of the beam, and extending 

 for a distance of 8 feet from the end. Fig. 25. The distance between 

 the portions of the beam above and below the plane of -hear at the end 



11 



