880 
ME. HODGKDfSOX’S EXPEEDIEXTAL EESEAECHES 
Table III. (continued). 
No. of Ex- 
periment. 
Description of Pillar : each being cast 
solid, 2^ inches diameter nearly, and 
turned, 10 feet long, 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 jr from formnla 
where W is the breaking weig^it, D 
the diameter, and z the streng^ of a 
pillar 1 inch diameter and 10 ft. long. 
Value of X 
from, 
formula 
W 
Remarks. 
inches. 
lbs. 
inch. 
inch. 
lbs. 
lbs. 
lbs. 
6. 
Portland Iron, No. 1. 
20693 
•065 
•09 
Tovine, Scotland. Hot blast. 
25397 
•075 
Mean diameter from eight 1 2-527 
30101 
•086 
•11 
measurements J 
34805 
■097 
Weight of pillar 156^- lbs. 
39509 
•107 
•17 
44213 
•118 
48917 
‘130 
•27 
53621 
•145 
•41 
58325 
•159 
•58 
60677 
•170 
•77 
62559 
•179* 
•92* 
62559 
2328-3 
2438-8 
7. 
Calder Iron, No. 1. 
20693 
■069 
•04 
Lanarkshire. Hot blast. 
25397 
•081 
Mean diameter from eight 1 
30101 
•093 
•05 
measurements d] 
34805 
•105 
Weight of pillar 149 lbs. 10 oz. 
39509 
•116 
•08 
44213 
•128 
48917 
•140 
•15 
53621 
•153 
•25 
58325 
•169 
•38 
60677 
•177* 
•45* 
60677 
2379-7 
2490-7 
• 8. 
Calder Iron, No. 1. 
20693 
•069 
•06 
Lanarkshire. Hot blast. 
25397 
•081 
Mean diameter from eight ] g-SlO 
30101 
•092 
•08 
measurements j 
34805 
•104 
Weight of pillar 161f lbs. 
39509 
•115 
•14 
44213 
•127 
48917 
•140 
•28 
53621 
•154 
•43 
58325 
•179 
•83 
60677 
•192* 
M3 
60677 
2283-8 
2391-8 
9. 
London Mixture. 
20693 
•069 
•04 
One-half old plate iron and 
25397 
•082 
one-half Calder iron. 
30101 
•095 
■06 
Mean diameter from eight ] 0.533 
34805 
•107 
measurements j " 
39509 
•121 
•14 
Weight of pillar 162|- lbs. 
44213 
•134 
•20 
48917 
•149 
•35 
53621 
•183 
•94 
54562 
•190* 
1-06* 
54562 
2013-7 
2109-4 
10. 
London Mixture. 
20693 
•067 
•09 
1 
One-half old plate iron, and 
25397 
•079 
one-half Calder iron. 
30101 
•091 
•12 
Mean diameter from eight f o.g^g 
34805 
•103 
measurements j “ 
39509 
•114 
•20 
Weight of pillar 156 lbs. 14 oz. 
44213 
•126 
•23 
48917 
•139 
•33 
! 
53621 
•153 
•48 
1 
/•180 to 
•91 to 1-00 
i 
\'182 
in 2 minutes. 
1 
59266 
■188* 
110* 
59266 
2141-9 
2244-4 
j 11- 
Level Iron, No. 1. 
20693 
•070 
•08 
1 
Staffordshire. Hot blast. 
25397 
•082 
Mean diameter from eight 1 o.jjg 
30101 
•094 
•13 
measurements / 
34805 
•107 
Weight of pillar 151 lbs. 2 oz. 
39509 
•122 
•23 
44213 
•137 
•34 
48917 
•156 
‘53 
53621 
•196 
1-08 
54091 
•199* 
114* 
54091 
2038-8 
2135-2 
12. 
Level Iron, No. 1. 
20693 
•069 
•08 
Staffordshire. Hot blast. 
25397 
•082 
Mean diameter from eight 1 2 . 5 Q 1 
30101 
•094 
•13 
measurements j 
34805 
•107 
Weight of pillar 150^ lbs. 
39509 
•121 
•24 
44213 
•132 
•31 
48917 
■147 
■45 
' 
53621 
•167 
•74 
1 
1 
56443 
•179* 
•91* 
56443 
2179-2 
2281-5 
