108 Mr. J. J. Guest on the Strength of 



Synopsis of Tube-Tests, 

 notation. 



The tests on any tube are numbered in order of performance. 



All results refer to the yield-point. 



P =actual tension-load on specimen. 



W=load producing the torque 15 W. 



p = corrected value of internal pressure. 



Axial-strain = actual reading of the axial extensometer-scale. 



Twist-strain = ,, „ twist-scale. 



p =the tensile-stress due directly to P. 



q =the shearing-stress due directly to W. 



^j = the axial stress due directly to p . 



■m x , -or 2 , •w 3 =the principal stresses. 



Axial strain as measured— the value of the strain as deduced from the 



reading of the axial scale. 

 Twist-strain as measured = the value of the slide as deduced from the 



reading of the twist-scale. 

 i] v t]. 2 , t] 3 are the principal strains. 



Table IV. 

 Diameters, Elastic Constants, &c. of Tubes. 



No. of 

 Tube. 



Material. 



Diam. 



Thick- 

 ness. 



Area. 



E. 



C. 



<T. 



I. 



Steel 



1-316 



0029 



01175 



30,400,000 



10,960,000 



0-39 



II. 





1-250 



0028 



0-1075 



29,500,000 



11,450,000 



0-287 



III. 



,, 



0-4987 



0-0245 



00364 



28,900,000 



10,660,000 



0-355 



IV. 



,, .... 



1-25 



0-025 



00971 



31,100,000 



11,170.000 



0-393 



V. 



.... 







. 



31,700,000 



11,700,000 



0-355 



VI. 



, 



,, 







30,900,000 



11,500,000 



0344 



VII. 







„ 



J} 





28,800,000 



10,850,000 



0-328 



VIII. 













31,000,000 



11,200,000 



0-365 



IX. 









J? 





29,600,000 



10,400.000 



0423 



X. 



Copper ... 



1-251 



00362 



014113 



18,100,000 



6,280,000 



0-43 



XI. 



,, 



. 







17,200,000 



6,000,000 



0-43 



XII. 





1-255 



0-034 



01295 



15,000,000 



5,020,000 



0-45* 



XIII. 





» 



» 



u 



14,760,000 



4,760,000 



0-50 



The units for the above table are lbs. wt. and inches. 

 Solid Bars, Elastic Constants, &c. 



Material. 



Diam. 



Area. 



E. 



O. 



<r. 



Norwegian Iron ... 

 Mild Steel 



0-628 

 0-504 



0-3095 

 0-1992 



29,700,000 

 31,800,000 



11,160,000 

 11,270,000 



0-33 

 0-40 





