28 ROYAL SOCIETY OF CANADA 

SERIES IV. 
2,400 lbs. 4,800 lbs. 7,200 lbs. 9,600 lbs. 1,200 lbs. 
— 951 — 6514 — 790 — 1060 — 1330 
— 103 — 213 — 342 — 460 — 581 
+ 14 + a0 + 36 + 41 + 46 
141 + 297 + 482 + 567 + 706 
290 + 6588 + 853 + 1111 + 1352 

By plotting the above results, diagram XX VIII. was obtained. 
TABLE OF MAXIMUM BENDING MOMENTS AND DEFLECTIONS. 





Load in lbs. Max. Bending Mo- Deflections in 
ment in in.-lbs. inches. 
2400 36000 -003 
4800 72000 006 
7200 108000 “010 
9600 144000 “014 
12000 180000 017 

An inspection of diagrams VII. to XXIV., for the cast steel beam, 
shows that in all cases the stresses in the material are very approxi- 
mately proportional to the distance from the neutral surface and that 
this neutral surface very approximately coincides with the centre of 
gravity, indicating that, in the case of the concentrated loads, the varia- 
tion of stress in the beam in question is closely in accordance with 
theory. 
In diagrams XV. to XX VIII, plotted from the results obtained for 
a beam loaded at the centre, the neutral surface has very appreciably 
moved towards the compression side, but the stress in the material is 
still proportional to the distance from the neutral surface in its changed 
position. 
