124 On the Strength, Durability and Value 
EXTRACTS FROM PROFESSOR BARLOW’S AND CAPTAIN BAKERS 
. TABLES. 
ht. 
Weight and De- 
flection while 
Elasticity re- 
mained perfect. 
io 
13 
Ultimate Deflection. 
Depth of Neutral Axis. | 
Value of Ultimate 
Deflection. 
Value of Elasticity. 
Value of Strength. 
Value of Strength. 
Direct Cohesion on 
square inch. 
Breaking We 
Deflec- 
Weak tion in 
in lbs. 
— 
a 
n 
. finches 
A 
the Mean Results are given. } 
Specific Gravity. 
< 
9g 
< 
leo} 
No. of Experiments of which 
Captain Baker's Experi- 
ments on specimens of 
Morung Saul, 6 feet be- 
tween the supports, and 
2 inches square. 
Cut clear of the heart ....| § 1121] " 9306382 | 2529 
Ditto, near the outside .. 7 1008 “75 8934121 | 2967 
Prime seasoned 1192 ‘ 9406451 | 2684 
Beam of Tully Gunge 
Bridge, built in 1812 863 ‘ 6888188 | 1949 
re-built, 1819. 
Young timber clear ofheart 1040 : 8675702 | 2340 
Ditto near the heart .... g 946} 3:8 7724503 | 2128 
Professor Barlow's Expe- 
riments on pieces 7 feet 
between the supports, and 
2 inches square. 
9657802 | 2462 |2488 
6759200} 2221 |2266 
3494730] 1181]1205 
5806200} 1672/1736 
8595864 | 1766)1803 
4765750 | 1457|1477 
3885700} 1383]1409 
6580750} 2026 )2194 
5417266] 1556|1586 
2799347 | 1013}1042 
4900466) 1632]1666 
7359700) 1341 | 1368 
5967400} 1102)1116 
| 0314570 1108)1131 
English Oak 
IDM) Sodssudqnuadoosads 
Canadian ditto 
DD ATAPZTEMATECO wyetelciesei e's cies 
Adriatic ditto 
2 cw 0 
ONISID 
Www 
ao 
Pitch Pine .... 
Red Pine 
New England Fir 
Riga ditto 
CR 
[ore 2} 
Ow 
09 C9 C9 G9 CO C9 GD CD CO US CO CD CO OD 
PSRUIBDAAUDUE BHA 
paar eee eee 
mawenrwwwonw 
Or ca S 
* The above should be compared with the other experiments by the constant numbers ; 
or, if by the breaking weights, they should be reduced in the ratio of 7 to 6. 
