The maximum skin stress due to this load is 8382 Ibs. per square 

 inch. 



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

 deflection of .32-in. between loads of 1000 Ibs. to 5500 Ibs., is 

 1,559,950 Ibs. 



Table B shows the several readings. 



The weight of this beam on May llth was 44 Ibs., or 36.76 Ibs. 

 per cubic foot, and its weight on May 22nd was 42 Ibs. 14 ozs., or 

 35.74 Ibs. per cubic foot, showing a loss of weight in the laboratory at 

 the rate of .0927-lb. per cubic foot per day. 



Beams IX to XVI were sent to the laboratory by Mr. P. A. 

 Peterson, chief engineer of the Canadian Pacific Railway. 



Beam IX was grown on the mainland half way between Vancouver 

 and New Westminster, in a flat country not much above the sea 

 level. It was cut from a log 26 ins. in diameter and 34 feet in 

 length^which was felled about the month of May, 1892. The log was 

 floated to the mill at Vancouver, and lay in fresh water for ten months. 



The timber corresponded to first quality in the market, its grain 

 being straight and running parallel to the axis. It contained a season 

 crack on the widest face, about 11 feet long, 3J ins. below the edge, and 

 about 1 in. deep. The beam was tested Nov. 13th, 1893, with the 

 annular rings as in Fig. 13, the heart of the tree being in one of the 

 vertical faces. Under a load of 51, 600 Ibs. this beam failed at the 

 support by the tearing apart at the centre of the fibres on the tension 

 face. 



The maximum skin stress corresponding to this load is 7974-lbs. per 

 square inch. 



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

 deflection of .77-in. between the loads of 1000-lbs. and 20,000-lbs., is 

 1,767,990 Ibs. 



Table C shows the several readings. 



The weight of the beam was 603 Ibs., or 36.49 Ibs. per cubic foot on 

 Oct. 3rd, 590 Ibs. 13 ozs., or 35.76 Ibs. per cubic foot on Nov. 10th, 

 and 590 Ibs. on Nov. 13th, showing a loss of weight while in the 

 laboratory at the rate of .0195-lb. per cubic foot per day. 



Beam X. This beam was tested Nov. llth, 1893, with the annular 

 rings as in Fig. 14. It was cut from a log 32 ins. in diameter grown 

 on the mainland 120 miles north and west of Vancouver, on a hill 

 side about 100 feet above tlie sea-level. The log was felled in the 

 winter of 1892-93, and was then towed to the mill, and remained in 

 salt water six months. 



The grain in this beam ran crosswise, and it failed by a cross frac- 

 ture along the plane AB, Fig. 15. 



The fracture occurred under a load of 18,000 Ibs., corresponding to a 

 maximum skin stress of 4027 Ibs. per square inch. The co-efficient of 

 elasticity, as determined by an increase in the end deflectionsof .84-in. 

 between the loads 1000-lbs. and 15,000 Ibs., is 1,637,806 Ibs. 



Table C shows the several readings. 



The weight of the beam was 407 Ibs. 2 ozs., or 38.94 Ibs. per cubic 

 foot on Oct. 3rd, 406 Ibs. 8 ozs., or 37.80 Ibs. per cubic foot on Nov. 

 10th, and 404 Ibs. 13 ozs., or 37.79 Ibs. per cubic foot on Nov. 13th, 

 showing a loss of weight in the laboratory at the rate of .03-lbs. per 

 cubic foot per day. 



Beam XI. This beam was tested November, 7th, 1893, with the 

 annular rings as in Fig. 16. Its history is the same as that of Beam 



