was3-10ths of an inch. Figs. 23 and 24 are sections at tli<> end and 

 at the centre showing the nature of the fractures. 



The total compression of the material was 1.83 ins., and tlie max 

 iinum skin comprcssive stress, taking 13. 295 ins. as the effective depth, 

 is 5103 Ibs. per square inch, the corresponding stress in the tension 

 skin being 6851 Ibs. per square inch. 



Assuming the ordinary law to hold good for the whele <,i' iliis effective 

 depth, the maximum skin stress would he (1350 Ibs. per square inch. 



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

 deflection of .335-ins. between the loads 10,000-lbs. and :;u.()00 Ibs., 

 1- 1.259,600 Ibs. 



Table F gives the several i\a HIIL>. 



The weight of the beam, when shipped from Vancouver about April 

 21st. wa.s 42^ Ibs., or 37. 21 Ibs. per cubic foot; on reaching the I.almra 

 lory on June Oth, the weight was found to be 411 His. Ill ozs.. or .'l.'i.T^ 

 Ibs. per cubic foot, and en the day of the test, namely, June 24th, the 

 weight was 404 Ibs. S oz>.. or :',.*). 17 Ihs. per cubic foot, sliowing a loss 

 at the rate of .0201 S ib per cubic foot per day b 'tween Vancouver 

 and the lalioratory, and a lots at the rale of .040I'.7-1)>. per cubic font per 

 day while in the laborat<iry. 



IJcaui XVIII. This. beam was coarsegrained, and contained several 

 large and small knots : it was cut from tin- heart of the tree. It was 

 tested Sept. 28ih, 1C94, with the annular rings as in Fig. 2ii. 



The load on the beam was gradually increased to 12.000 Ibs. 

 "The beam was now gradually relieved from strain until the load had 

 been reduced to 1000 Ibs. without showing any set. The load wa 

 again gradually i> creas :(1 from 1000 Ibs. up to 19,000 Its., when the 

 beam was again relieved from load and the readings were taken lin 

 each difference of 1,000 Ibs. 



When the load had been reduced to 1000 Ibs , the deflection at the 

 ei ntre was observed to be .015-in. as compared with .005-in. in the 

 forward movement, and as soon as the beam was relieved of this 1000 

 Ibs., it returned to its initial condition without showing any set what- 

 ever. 



The time occupied by the fiivt loading was 10 minutes, by the second 

 loading 12 minutes, and by the relieving from load 8 minutes. 



In the final test the lead was gradually increased from nil until it 

 amounted to 60,400 Ibs.. when the beam failed by shearing longitu- 

 dinally, the shear being immediately followed by the tearing apart of 

 the fibres on the t nsioii f ee. Figs 27 28, 20. 



The maximum skin .-tre>s e<ine>pondiue. t" the breaking load was 

 519G Ibs. per square inch. 



The co-efficient of elasticity, as deduced from an increment in the 

 deflection of l-10th of an inch between the loads of 2000 Ibs. and 12,000 

 Ibs., being i. 329,900 Ibs. 



Table F gives the several readings. 



The weight of the beam at the date of shipment from Vancouver, 

 April 21st, was 512 lbs. ; or 30.08 Ibs. per cubic foot On reaching 

 the laboratory, on Juno 9th, this weight was 402 Ibs. 1(1 ozs., or :>7.o'l/ 

 Ibs. per cubic foot, and the weight on Sept. 25di was 4(.iii Ibs. i! ozs., 

 or 35.59 Ibs. per cubic foot, showing a loss in weight between Van- 

 couver and the laboratory at the rate of .0302-lb per cubic foot per 

 day, and a loss of weight in the laboratory at the rate of .01 Si -]b. per 

 cubic foot per day. 12 



