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218

Cost per square
yard delivered
in Fulham,
Cost per yard
laid.
Tensile strain
in lb. per
square inch.
Compressive
strain lb. per
square inch.
Thickness in
inches.
Weight in lb.
per cube foot.
Imperial
4/6
5/7½
980
9,492
2 3/16
Croft
4/9
5/6
Vestry preparing
ground
..
9,394
2
132
Victoria
5/3
5/9 to 6/-
1,125
8,321
2
144
Stuart's Granolithic
4/8¼
5/5½
1,000
8,500
2
. .
Jones' Annealed
4/8
5/5
510
One month old
1,500
Twelvemonths,,
..
2¼
150
York
6/6
7/6
..
5,714
3
156
Good Artificial Stone succeeds where York Stone fails. It is of a uniform
temper and homogeneous throughout, and consequently its wear will be uniform.
It increases in toughness with age, it forms a very even and regular footway, it
is clean and cheerful, almost non-absorbent, and consequently dries quicker
than York Stone. The stones are made of uniform size and therefore present
a regular appearance; it has been said that in wet weather it is very slippery,
but I am of opinion that it is far more slippery in dry weather, especially when
we consider that leather has a great adhesive power on wet stone.
The following tests were made to find the comparative wear of the following
stones, which were of equal superficial area, all bound together with cord
so that each stone found its own bed when rubbed on York stone with sand
and water:—
York.
Imperial.
Victoria.
Croft.
Thickness beforebeing rubbed
2¼
2 9/48
2 3/48
2 1/48
First hour
2 3/24
2 4/24
2 1/24
2 1/48
Second hour
2 3/48
2 7/48
2 1/48
2
Third hour
2 1/48
2 6/48
2
1 23/24
Total wear in three hours
11/48
3/48
3/48
3/48
Stuart's Granolithic and Jones' Annealed received too late for testing.
From these figures it will be seen that the total wear in the three hours was
for York 11/48 of an inch, Imperial 3/48 Victoria 3/48 Croft 3/48.
This experiment is interesting as showing that the wear of York was 1/8 in.
more than that of Artificial Stone, also that the Imperial, Victoria, and Croft
wore equally, and would therefore be of the same degree of hardness.