Experiments on American and Foreign Building Stones. 9. 
= 5. Experiments by Mr. Rennie on mien tested in 14 inch 
cubes. 
ste Lbs. ae Hobstive 
sq. inc 
1. Aberdeen blue granite, m3 0,913 167 
2. Peterhead hard close grained granite, Eettints : F- 354 
3. Cornish granite, : ‘ ; 6,356 272 
[4. Alum limestone, as above, . : ‘ 2,334 100] 
6. Mr. Rennie’s experiments on sandstones. ua 
cy tae? ae 
1. Very hard freestone (13-inch cubes), . 9446 404 
2. Dundee sandstone, breccia, do. ; 6630 284 
3. Bramley falls sandstone near Leeds, do.. . 6063 259 
4, Craigleith white freestone, do. ; 5487 234 
5. Portland stone, do. 2 : : 4570 195 
6. Killaly white freestone, do. . ‘ ‘ A561 195 
7. Derby grit red friable sandstone, average of 
two varieties, do. : 3743 160 
8. Portland stone in a 2-inch cube, ‘ : 3729 159 
[9. Alum limestone, as before, . : ; 2334 oh 
Note.—The weakest of the above sandstones is 27 per ¢ 
cer than he strongest specimen of the “alum Ab passe 
tried by Dr. Pa 
‘er Raperinients by Messrs. Daniel and Wheatstone, on the 
magnesian limestone of Yorkshire, Derbyshire and Nottingham- 
shire in England, employed in building the new Houses of Par- 
liament.* Tested in two-inch cubes, in duplicate. 
Lbs. per Relative 
1 Stone of Kiveton, . ; : ‘ 10,695 
2 tone-ends, ' 4 9,209 394 
3. ‘“« Bolsover Moor, . : ‘ 8,288 355 
A. “  Kiveton, 2d variety, . . 6,163 284 
5. “  Norfall, ‘ ‘ 5,879 252 
6 “ — Steetley, yellow variety, : BAZ. -* Wan 
7 “  Steetley, white do. 3,192 136 
[8. Alum limestone of Maryland, as before, 2.334 100] 
Note.—The average strength of the seven varieties of stone 
above sealing is exactly three times as great as that of the = 
“alum limesto 
The stone set for the houses of Parliament is described as 
standing, in its natural site, high above the ground, in large masses 
Or perpendicular walls, with its smooth, bleached, time-worn 
Surface, discolored only by a few lichens with a little moss or 
ivy,—facts clearly indicating its strength and durability. 
Be 
* See « Lithology, or observations on _ for building,” ov C. H. Smith, p, 22. 
_ Btoonn Sentss, Vol. XI, No. 31.—Jan., 1 
a. 
i ee 
Me 
