IMPACT UPON BEAMS. 
Ill 
Impact upon the beam to deflect it. 
Impact upon the weight to deflect the beam. 
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The observed deflections in this latter case, where the impact 
was upon the weight, were somewhat higher than the calcu¬ 
lated ones, while in impacts upon the beam itself they were less 
than as calculated. It is evident that the elasticity from the 
collision had here some effect, as might be expected. 
Before the experiments on impact the beam was laid on two 
supports, 6 feet 6 inches asunder, and was bent *78 inch by 123 
lbs. (including the pressure from its own weight) applied gently 
in the middle. 
5th, 6th, and 7th Beams.—These were three cast iron bars 
from the same metal, each 4 feet 6 inches long, full inch square, 
, and 14 lbs. 10 oz. weight, nearly. They were supported by 
props 4 feet asunder, and the impacts were given against the 
beams alone; first in the middle, and afterwards half-way be¬ 
tween the middle and one support. 
The striking body was a ball of cast iron, 44 lbs. weight, sus¬ 
pended by a 16-feet radius. 
Impacts in the middle of the Bars . 
Chords of arcs 
Velocities per 
Deflections of 
Deflections of 
Deflections of 
Mean between 
second, com- 
the 5th beam, 
the 6th beam. 
the 7th beam. 
the deflections 
fallen through, 
puted from the 
in parts of an 
in parts of an 
in parts of an 
of the 6th and 
in feet. 
1 
chords. 
inch. 
inch. 
inch. 
7th beam, in 
the middle. 
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1*414 
•23 
1*5 
2-121 
•28 
•26 
•26 
2 
2-828 
•42 
•33 
•37 
•35 
2*5 
3-535 
•50 
•42 
*49 
•46 
3 
4*242 
*59 
•53 
•56 
*55 
3-5 
4-949 
•67 
•68 
•67 
•67 
4 
5-656 
•82 
*79 
•76 
•77 
4*5 
6-363 
*85 
•85 
5 
7-070 
•97 
*97 
•92 
•95 
5*5 
7*777 
1-05 
1-05 
6 
. 
8-484 
Broke in the 
middle. 
