882 
ME. HODGKIXSO:s’S EXPEEBIEXTAL EESEAECHES 
Table III. (continued). 
No. of Ex- 
, peviment. 
Description of Pillar; each being cast 
solid, 2^ inches diameter nearly, and 
turned, lOfeetlong, and flat at the ends. 
Weights 
laid on. 
Decrement 
of length. 
Deflection of 
middle. 
Breaking 
weight, or 
that with 
which the 
pillar sank. 
w 
Value of X from formula x = — — , 
where W is the breaking weight, D 
the diameter, and or the streng^ of a 
pillar 1 inch diameter and 10ft. long. 
Value of z 
ftom 
formula 
_ 'V 
D3*5’ 
Remarks. 
inches. 
lbs. 
inch. 
inch. 
Ihs. 
lbs. 
lbs. 
21. 
Second London Mixture. 
20693 
■061 
Two-thirds of old metal and 
25397 
■071 
one-third of No. 1 best 
30101 
•081 
Scotch pig-iron. 
34805 
•092 
Mean diameter from I2-511 
39509 
•103 
*05 
measmements J 
44213 
•113 
•08 
Weight of pillar 153 lbs. 
48917 
•128 
•16 
1 
I 
53621 
•141 
■29 
1 
58325 
•156 
•46 
i 
63029 
•186 
63499 
•189* 
•66* 
63499 
2417-2 
2531 -1 
j 
22. 
Second London Mixture. 
20693 
•060 
1 
Two-thirds of old metal and 
25397 
•071 
one-third of No. 1 best 
30101 
•081 
•05 
Scotch pig-iron. 
34805 
•091 
Mean diameter from eight 1 o ..nn 
39509 
•102 
•10 
measurements J 
44213 
•114 
•18 
1 
Weight of pillar 151^ lbs. 
48917 
•127 
•30 
53621 
•143 
•53 
58325 
■159* 
•70* 
58325 
22680 
2374 1 
j 
! 
23. 
Second London Mixture. 
7284 
•02 
Two-thirds of old metal and 
9521 
• , . 
•13 
one-third of No. 1 best 
10980 
•70 
11204 
Scotch pig-iron. 
Mean diameter from eight 1 , 
, /'I. OoU 
measurements J 
Weight of pillar 56 lbs. 2 oz. 
24. 
Second London Mixture. 
7284 
•12 
Two-thirds of old metal and 
9524 
•22 
one-third of No. 1 best 
9972 
•30 
Scotch pig-iron. 
10420 
•42 
Mean diameter from eight 1 
10532 
•48 
10868 
measurements ....J " 
Weight of pillar 56 lbs. 2 oz. 
