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143
The following information is placed in a tabular from for purposes
of comprison. The figure are obtained from Timber and
Timber Trees,written by Mr. Thomas Laslett, Timber Inspector to
the Admiralty.
Table I.—AVERAGES.
Description of
Work.
Deflection in Inches.
Weight in lbs.
required to break
each piece.
Weight in lbs.
required to break
one square inch.
Tensile Experiment.
Direct Cohension in
lbs. per square inch.
Crushing Strains
Classed at
Lloyd's.
With apparatus
weighing 390
lbs.
After weight
removed.
At crisis of
breaking.
In Tons.
In Tons, per
square inch.
Karri
1.01
.04
6.06
862
215
7,070
6" cube
185
5.14
12 yrs.
Jarrah
3.21
.133
4.71
685
171
2,940
2" cube
12.762
3.198
12 „
Teak
1.65
.083
5.37
912
228
3,301
2" cube
11.35
2.828
14 „
English Oak
3.37
.189
7.35
776
193
7,571
2" cube
13.625
3.406
9 „
Fir
1.62
.066
5.14
876
219
3,231
2" cube
12.687
3.172
The results in the following table are obtained from experiments
made with blocks shown to you to-day.
Table II.
After being kept in
office several weeks
near fire shewed.
Contents of blocks
dry.
Weight dry.
Weight in lbs. per
cube foot.
Specific
gravity.
Increase in weight
per cube foot after
72 hours immersion.
Increase in bulk of
specimens after
Immersion.
Proportionate
increase in bulk
from expansion
after immersion.
c. in.
lb.
oz.
lb
oz.
in.
Karri blocks
9" x 4" x 3"
Numerous small
cracks.
418.6
15
4
62.911
1.0077
2
13
9.7
.231
Karri block
9" x 5" x 3"
65 00
1.0412
Jarrah blocks
9" x 4" x 3"
Some
fine cracks.
434
13
13
51.96
.832
4
12
16.0
.0368
Jarrah block
9" x 5" x 3"
56.00
.897
Deal blocks
9" x 4" x 3"
Large openings
extending across
blocks, and
blocks warped.
432
8
4
33.00
.52
5
12
10.0
.023
Deal cresoted blocks
9" x 4" x 3"
A few slight
cracks.
440
11
4
45.00
.72
4
0
25.0
.056