This section is from the book "Notes On Building Construction", by Henry Fidler. Also available from Amazon: Notes on building construction.
Mr. Walker exposed the undermentioned descriptions of granite and whinstone to very heavy waggon traffic for seventeen months, and found their vertical wear to be as follows :-
Inch. | |
Guernsey granite | •060 |
Herm ,, | •075 |
Baltic whinstone | •082 |
Peterhead blue granite . | •131 |
Inch. | |
Heytor granite | •141 |
Aberdeen red granite . | •159 |
Dartmoor granite | •207 |
Aberdeen blue granite . | •225 |
Mr. Newton's experiments on the flags used in Liverpool showed Kilrush flags to be most durable, Caithness flags next. The flags found to be least durable were those from Llangollen and Yorkshire.1
1 D. Kinnear Clarke On Roads and Streets.
 
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