I: 11 \l\ Tin- lie in. ., . plii.|i.il;\ ;,Miil i|llalit\, with 



i.iin all I lin kii"|s. I r i\ i te.vdOet -nd.]-''! V. it li tin a mill- 

 Inr riii'j-- i' ' cal. a- in l''i'_'. l.n. 



ftg 3 o 



'I i.i l"a I Oil the I' 'Mil W I.- glaillialiy increased Up In 1 li.llOO Hi-. . 



iualU ri lirvcii I'mni load, [lie readinu'- being taken liu 

 'ach diintnui '':'. of IIHMI UK. 'I'll' 1 convspnuiliii'.; reading- an- indicated 

 in Tahlo F 



\\ 'h. n it wa- completely lelievcd from load, t li, 1 scales -In :\\ ml reading- 

 if. I n.'i in at tin 1 centre, .dill -in ami .00.'! in ;it the ends. These reading- 

 .veiv |.ri'li:ilil\ ilu.' t 1 ' inci'inalitios in the timber or a possible' slulini.' 

 '!' the .-Clio, as tin- 1' am .-hnwul IH> ("'i.!' 1 !!! -imi ol' srt . 



Tin 1 I. .ail w:is njjiiin iniiiiciliaioly increased gradually from nil until it 

 unlimited to .">!'. 510 !!., when the ln'iun failed l>y longitudinal sliear, 

 fi'llmved liv tin 1 splintering of the upper edges on the tension side. 

 !1, :i^. Fracture \\a- also indicated liy the crippling <'t' the fibres on the 

 "inpre.->iiin side taking place between 58,000 and 59,540 Ibs. 



The distance between the portions ol' the beam above and below tin 

 plane id' shear at the end was ..'!(! in. as in the figure. 



The maximum skin i-iress corresponding to the breaking load is 9043 

 I's. per square inch. 



The co-efficieut of ela-ticity, as deduced by an increase in the deflec- 

 tion ol' .3-in. between the loads of :M<10-lhs. and 10,000 Ibs., is 

 1,934,000 Ibs. 



Table F shows the several readings. 



The time occupecl by the first loading was 10J mins.. by the relieving 

 from the load fi ',' mins., and by the second loading from nil to the max., 

 1 ."> I inius. 



The weight of this beam on April 21st, the daU' of its shipment 

 from Vancouver, was 410 Ibs., or 44. 99 Ibs. per cubic foot. On reaching 

 the laboratory the weight was 392 Ibs. 8 ozs., or 43.07 Ibs. per cubic 

 and tiie weight on Oct. 2nd, the date of the test, wa* 375 Ibs. 

 10 ozs., or 41 .22 Ibs. per cubic foot, showing a loss of weight at the rate of 

 . o.'iii'J Hi. per cubic foot per day between Vancouver and the labo- 

 ratory, and a loss at the rate of .0161-lb. per cubic foot per day 

 while in the laboratory. 



Iieam XX. This beam was cut from the heart of the tree, and was 

 1 N iv. 3rd.. 1894, with the annular rings as in Fig. 33. 



It was coarse i^raiiud. the grain being very nearly parallel with the 

 -. and contained a number of knots. 



I 



35 Sra*.f9f* 







The load wa- gradu illy inereas 'd until it amounted I'J.HOO ilis.. 



ind at this point the beam was jia lually reli 'v d from load, readings 



l ing taken Inr every diminution of 2000 Ibs. When the load had been 



500 Ibs.. the reading at the centre was .001-in., probably 



due to a movement of the sealo. The load was again mutually increased 



13 



