110 
FIFTH REPORT— 1835 . 
Leaden ball, weight 
9 oz. 7 dr, 
1 
Bell metal ball 
9 oz. 7 drs 
weight 
• 
Sheer steel ball, weight 
9 oz. 7 drs. 
Chord of arc 
each ball fell 
through. 
(Radius 3 feet.) 
Calculated de. 
flection by each 
ball. 
Observed deflec¬ 
tion. 
Observed recoil. 
Calculated re¬ 
coil. 
1 
Observed deflec¬ 
tion. 
Observed recoil. 
Calculated re¬ 
coil. 
Observed deflec¬ 
tion. 
Observed recoil. 
Calculated re¬ 
coil. 
1 
•087 
•07 
•76 
•08 
•8 
•87 
•09 
1*0 
•93 
2 
*17 
•16 
1 ‘5 
1-70 
•17 
2*0 
1-85 
•18 
1-96 
3 
•26 
*28 
3-5 
3-05 
•26 
3'5 
2-83 
•27 
3-7 
2*94 
4 
’35 
*45 
4-3 
4’90 
•41 
4-0 
4*46 
•40 
5-0 
4-35 
The anomalous character of the results of the experiments 
with the small balls, compared with those from the larger ones, 
may perhaps arise from the difficulty of observing the results of 
small impacts. 
Previous to any of the experiments on impact upon this beam, 
it was laid on supports 6 feet 6 inches asunder, and bent by 
weights in the middle, in the same direction that it was after¬ 
wards bent by impact. The results are as below : 
Its own weight (or pressure from half of its 
weight between the supports) = 6 lbs. 14 oz. 
28 lbs. + 6 lbs. 14 oz. (its own pressure) — 
34 lbs. 14 oz. 
56 lbs. -f 6 lbs. 14 oz. — 62 lbs. 14 oz. = 1006 oz. 2*56 — 
To calculate, as before, the deflections and recoils, we had here 
p — 1006 oz., e = 2'56 ins., r ~ 6 lbs. 14 oz. = llOoz., w = the 
various striking weights, and the rest from the data, as in the 
preceding cases. 
In the experiments upon this beam which were made the last 
of those where the impact was horizontal, additional care was 
taken to prevent the resistance of the clay from rendering the 
deflections less than they ought to be, as it was conceived that 
this cause had in some degree reduced the deflections in most of 
the other beams which had been struck horizontally. 
w 
4th Beam.—This cast iron bar was, in section, 1*08 x 1*05 
inches, and 7 feet long, weighing 23 \ lbs.; it was placed against 
two supports, 6 feet 6 inches asunder, and bent by impacts in 
the middle. Weight of striking ball, of cast iron, 20j lbs. 
Radius 16 feet. 
In the first of the following experiments the beam alone was 
struck, as before, and, in the second experiment, a 56-lbs. weight 
of cast iron was suspended like a pendulum and made to touch 
the middle of the beam; the ball was then made to impinge 
against the weight, and thence deflect the beam. 
