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

 deflection of 1.12 ins. between the loads of 5000 and 10,000 Ibs., is 

 503,440 Ibs. ; as deduced from an increment in the deflection of .84-in. 

 between the loads of 5000 and 12,500 Ibs., is 463,768 Ibs., and as 

 deduced from an increment in the deflection of 2.13 ins. between the 

 loads of 5000 and 15,000 Ibs., is 534,169 Ibs. 



Table N shows the several readings. 



The weight of this beam per cubic foot on Feb. 16th was 37.25 Ibs.) 

 and on March 14th, 34.78 Ibs., showing a loss of weight at the rate of 

 .095-lb. per cubic foot per day. 



Beam XXXVII was tested on February 24th, 1893, with the 

 annular rintre as in Fig. 82. 



The load was. gradually increased until it amounted to 24,000 Ibs,. 

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

 face. 



The maximum skin stress corresponding to this load is 3555 Ibs. per 

 square inch. 



Beams XXXVI11 and XXX IX were the two ends of Beam XXXVI 

 which was tested February 16th, 1893, the central portion containing 

 the fracture having been cut out. 



Beam XXXVIII was tested on March 14th, with the annular rin^.s 

 as in Fig. 83 . 



The load on the beam was gradually increased until it amounted to 

 52,450 Ibs., when it failed by the tearing apart of the fibres on the ten- 

 sion side. 



The maximum skin stress corresponding to this load is 3075 Ibs. per 

 .square inch. 



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

 deflection of .37-in. between the loads of 10,000 and 25,000 Ibs., is 

 622,640 Ibs. 



Table N shows the several readings. 



Beam XXXIX was tested with the annular rings as in Fig. 84. 

 The load was gradually increased until it amounted to 51,400 Ibs., 

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

 side. 



The maximum skin stress corresponding to this load is 2696 Ibs. per 

 square inch. 



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

 deflection of .175-in. between the loads of 10,000 and 25,000 Ibs., is 

 433,250 Ibs. 



Table N shows the several readings. 



Beams XL and XLI are the two ends of Bt:am XXXVI! which 

 was tested on Feb. 24th, 1893, the central portion of the be.aui contain- 

 ing the fracture having been cut out. 



Beam XL was tested on March 17th with the annular rings as in 

 Fig. 85. The load was gradually increased until it amounted to 53,650 

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

 tension side. 



The maximum skin stress corresponding to this load is 3311 Ibs. per 

 square inch. 



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

 deflection of .19-in. between the loads of 12,000 and 26,000 Ibs., is 

 693,090 Ibs. 



Table N shows the several readings. 



The weight of the beam per cubic foot on the day of the test was 

 36.13 Ibs. 26 



