ae 
/, ; % - 
- . 4 4 
4 “> 7 
*. 
284 | A. BOYD. 
examination. The load was applied by placing equal weights 
in the buckets simultaneously. The deflections were 
plotted against loads for each position (see fig. 12), and the 
deflections for given loads were also plotted against positions 
on the rim 15° apart for one half of bay C (see fig. 13). The 
resulting curves shew that there was a large inflection in 
the rim near the arms. | 
Four-armed Wheel, straight arms.—The curves obtained 
for this wheel are shewn in figs. 14 to 17. Hach of the 
four half bays was measured, a pair of opposite bays being 
represented in each figure. There is some variation in the 
deflection of the bays, that of the bays B and C being 
greater than the others, especially at the high speeds. The 
arms AB, BC, ADare of approximately the same extension, 
whereas that of arm CD isa little less than the others. 
The deflections of the 11°25° position show some peculiarity; 
for the deflections of A 11°25° and C 11°25° are greater than 
those of the corresponding arms, whereas in the case of 
bays Band Dthe deflections are equal to those of the arms 
or even a little less. 
Four-armed Wheel, curved arms.—The results for this 
wheel are set forth in figs. 18 and19. The four bays were 
measured, two of them being shewn in fig. 19. It will be 
seen that the maximum deflection is at or near the arms ; 
there being a considerable inflection about midway between 
the arms. The maximum deflection obtained was at B 
11°25°, i.e.,on the concave side of the arm AB and amounted 
to 64 scale divisions at 18 revolutions per second. The 
maximum inflection was in the same bay between 45° and 
56°25° and was 22 scale divisions. Bay C (not shown) gave 
results very similar to bay A, the maximum deflection being 
at the arm BOC, and 5? less than that of AD in magnitude. 
The results for bay D (not shown) were similar to those for | 
bay B, the maximum deflection being at D 11°25’, and the : 
