APPARATUS FOR MEASURING STRAIN AND APPLYING STRESS. 



267 



Table I. 



Torque in 

 inch lbs. 



No Bending 

 Moment. 



Bending Moment 

 480 inch lbs. 



Bending Moment 

 800 inch lbs. 



Bending Moment 

 1120 inch lbs. 



Reading. A 



Reading. A 



Reading. A 



Reading. A 

























-51 



-51 



-50 



-50 



7-5 



51 



51 



50 



50 





-51 



-50 



-51 



-50 



15-0 



102 



101 



101 



100 





-51 



-51 



-49 



-50 



22-5 



153 



152 



150 



150 





-51 



-51 



-50 



-51 



30-0 



204 



203 



200 



201 





-52 



-51 



-51 



-51 



37-5 



256 



254 



251 



252 





-51 



-52 



-50 



-51 



45-0 



307 



306 



301 



303 





-50 



-50 



-51 



-51 



52-5 



357 



356 



352 



354 





-51 



-50 



-52 



-50 



60'0 



408 



406 



404 



404 





-51 



-51 



-51 



-49 



67-5 



459 



457 



455 



453 





-50 



-50 



-50 



-50 



75-0 



509 



507 



505 



503 







2 



1 



1 



2 



The differences caused by bending will be discussed in Section XL 



2. Machine for applying Torque and Bending. 



The apparatus used for applying twist in either direction, and for the combined 

 stresses of twist and. bending, is shown in side elevation by fig. 6, in plan by fig. 7, and 

 in sectional end elevation by fig. 8. The machine was specially constructed for the 

 work of this paper, and consists essentially of two similar and equal castings A, bored 

 axially to receive double-coned spindles B, the outer ends of which project through the 

 castings and are secured by nuts C. At the weigh-lever end the cone is secured to the 

 casting by studs D, but at the other end, in order to take up the twist upon the speci- 

 men, the cone is gripped partly by the back-nut C, and partly by a plate E pressed 

 against its face by studs. 



Each casting is bored at right angles to the axis to receive arms F G, of which the 

 former are used for hanging weights therefrom to give the torque, while the latter 

 one, G, carries a link H, having an adjusting screw I, and nut J, whereby the weigh -levers 

 F can always be brought to the horizontal position, the final adjustment being made 

 with a sensitive level K '; while the other carries a balance weight L. The ends of the 



