The following results are from Mr. Kirkaldy's experiments with 6-inch cubes :-

Stone.

Crushing Weight per Square Inch in Tons.

Scotgate ...

5.1

Brarnley Fall ....

1.8

Derbyshire do...

2.6

Craigleith..

5.4

Red Corsehill ...

3.5

Cunliffe ...

4.7

Leigh Carr..

7.2

Stone.

Crushing Weight per Square Inch in Tons.

Quarella (white)..

3.8

Do. (green)..

3.0

Grinshill..

2.3

Wilderness (red)..

3.3

Hopton Wood...

5.6

Spinkwell1 . . .

6.0