iii XI. I w .ich 17th. l-i'.i:i, with the annular 



t- In ' Tlic load ii|on tin- beam i-''d until 



it amounted to it. failed liy (In irt of the 

 ill tin' ten 



The maximum skio stress I'onvs.ponilini' tu this l<>ad is 25110 ihs. 



prr si|iiar iiii'ii. 



The co-efficieiii <>!' elasticity, as deduced from an increment in the 

 den 1 , ction of. Ill in. between tin- li.:nU of 10,000 His. anil 22,000 Ibs., i.s 

 ."il!'. v 2H I In. |T square inrli. 



Table N show- thr several reading. 



'I'lii' wi i-ht ol 1 tlir beam mi the day ol'test was 3(5.13 Ibs. per culii- 



liiMins. XI. II an -I .XI, VI vcre out out of one large piece of tqiure 



|iiin' niailc on the IVtti waw.-i. a trilntary ol the Ottawa, in 1888. Tlic 

 jiin-i- was drivi'ii uvcr \:',(W milrs, andlayin water for four years until 

 ii was takrn nut in the (all of lS|l;i and piled for winter sawing. 



This tiuibor was purrlia-ril frnin .Mcs^r^. Slic:iror & Brown. 



I '.::! in .XLII was trstcil .March Sth. IS'.l.'i, with the annular rings as 

 in IML-. *7. 



1 I . I 



89 



Tin 1 luad ou the be:im was gradually increased until it amounted to 

 26,350 Ibs., when the beam failed by the tearing apart of the fibres on 

 the tension 



The maximum skin stress corresponding to this load is 3815 Ibs. per 

 -<|iiare inch. 



The coefficient of elasticity, us determined by an increment in the 

 lictl.vtion of 1.22 ins. between the loads of 2500 Ibs. and 13,000 Ibs., 

 is 979, 220 Ibs. 



Table shows the several readings. 



The weight of the beam per cubic foot at the date of test was 41.49 



is XLII I an 1 XLIV arc the two ends of Beam XLII tested 

 March Sth, the central portion of the beam containing the fracture 

 having betn cut out. 



Beam XLII I was tested March '.\ 1st. with the annular rings as in 

 Big 



The load \yas gradually increased until it amounted to 48,600 Ibs., 

 when the beam failed by the tearing apart of the fibres on the tension 



side. 



Th" maximum skin stress corresponding to this load is 300C Ibs. per 

 si|iiue inch. 



The eo-enVieiit of elasticity, as determined by an increase in the 

 (1. II etion of .19-in. between the loads of 10,000 and 25,000 Ibs., is 

 ti t',1.780 Ibs. per square inch. 



Table O shows the several readings. 



licatn KL1Y wa< tc-tijd March 31st, 1893, with the annular rings 

 as in Ki;_'. 89 



The load upon the bean 1 was gradually increased until it amounted 

 to 51.S70 l!i>.. when il f lilcd by the tearing apart of the fibres on the 

 ten.-ion side. 



The maximum skin stress corresponding to this load is 3148 Ibs. per 

 s. |iiare inch. 



The coefficient of elasticity, as determined by an increment in the 

 deflection of .19-in. between the loads of 1000 and 25,000 Ibs, is 

 '>4'.>,780 Ibs. per sijiiaie inch, the same co-efficient as in beamXLIII. 



Table shows the several readings. 



27 



