416

EXPERIMENTAL INQUIRIES ON

Weightslaid onTube.

Deflectionsfrom thoseWeights.

Remarks on the Results.

Lbs.

Inches,

44925

■5

i — i

61978

•75

96084

1-27

130190

1-7

1_1

164296

1-8

181349

2-0

198402

2-2

The timber on which the

215455

2-35

tube was supported be-came crushed.

232508

Experiment discontinued

232508

2-85

in order that the timbermight be strengthened.

Experiment renewed.

238476

2-9

Rivets of the wrought-iron

249560

3-3

strap yielding slightly tothe strain.

Wrought-iron near to cast

266613

4-4

much compressed, andthe scales peeling off inlarge flakes.

With this weight the tube

273526

shewed no crippling orother defect, though itwas slowly yielding to thepressure, and emitted loudsounds.

The tube broke by tearing asunder the wrougbt-ironstraps at the bottom. The fracture commenced at the nearestrivet-bole to the middle. The cast-iron had shewn no si«ns

O

of weakness, and, after the experiment, remained sound,excepting one of the straps, which was cracked partlythrough, the crack beginning at the bottom. The breaking-weight was 122 tons 2 cwt.

This tube has been broken in Experiment 7 withtons laid on the middle, the distance between the supportsbeing 30 feet, and with 54-8 tons laid on a point where therectangle of the segments was 14 x 16 in Experiment 13.