- 
- 
wy % — 
_ No of trial. Kind of stone. squareinch. value. 
No. 1. gave per sq. inch 5445 Ibs. | No. 4. gave per sq. inch 4981 Ibs. 
‘ HE “ec a4 5185 cc 73 5. “ ts A338 oc ‘af 
alter the position of the “alum limestone,’ which stands, as 
"tested by Mr. Rennie, whether the latter were in 1, 13 or 2-inch — 
_ seuhes. ° : 
8 Experiments on American and Foreign Building Stones. 
Strength per Relative : 
3. Blue rock from Potomac, used as the back- 
ing stone of the National Monument, 3750 160 
A. Granite of the east (Port Deposit) : 3250 139 
5. Granite of Normandy,* 7 ‘ ‘ 2628 112 
[6. Alum limestone (monument), ; : 2334 100] 
4. Marbles and limestones tested and Reported on by Mr. 
Rennie in England.t+ 
Lbs. per Relative 
i value. 
No. ot trial. Kind of stone. sq. inch. 
1. White Italian veined marble (tried in 14 
inch cubes), . ‘ ‘ 2 : 81 A414 
2. Black Brabant marble (tried in 13 in.cubes,) 9281 395 
3. Purbeck stone, do., 9160 392 
4. Black compact limestone, Limerick, Ireland, 
(tried in 13 inch cubes,) . ; : 55 379 
5. Compact limestone, do. . ‘ 7713 330 
6. Devonshire red marble, do., : : 7187 308 
7. White statuary marble, not veined, do., 6058 259 
8. White Italian veined marble, tried in one- = 
inch cubes, .. Habe , ; 216 137.44 
[9. Alusn limestone, (as above, ) . «9334 100Re 
_ Note.—From his own reading of the original memoir of Mr. — 
Rennie, the writer was led to suppose that all the above samples 
of stone, numbered from 1 to 6 inclusive, had been tested in two- — 
inch cubes, and that the Numbers in the Philosophical Transac- — 
four-inch base they would stand as follows :-— 
ae & tt “ 5152 * “ 6, ce “« A178 “ a 
These numbers change the relative values but they do not : 
proved by Dr. Page, far below all the limestones and marbles, — 
* See below some account of other granites of Normandy, tried in two-inch cubes — 
Royal Society, 1818. 2 : 
t 
