Farm Roads on Stronr/ Soils. 95 



s. d. 



Lime 3 2i 



Gravel 7 6 



J) 10 8i 



2 8 

 Add labour of mixing and laying .... 2 6 



Cost of concrete per cubic yard . . . . 5 2 



Upon these figures the cost of the road per chain will be — 



£. s. d. 



i^orma^ion (as detailed) 16 



Foundation, 4 inches of concrete, 7J yards, at 5s. 2c:?. 



per yard, including laying 1 17 10 



Covering same depth, 1\ yards, at 2s. 6cZ. per yard .. 18 4 



Spreading Ih 



Finishing 1 2^ 



Total cost per chain 3 14 



No. 9. While treatinfj; of the clay districts of the oolitic forma- 

 tion, it may be desirable to refer to a suggestion made by the 

 writer in a paper read at the Central Farmer's Club in June, 

 1855, for the adoption of the perforated bricks made by Beart's 

 patent, as a foundation for roads in the fen districts overlying the 

 Oxford clay. It will take 2-376 bricks laid flat to form the 

 foundation of roads, with 9 feet metalling, and the approximate 

 cost will be — 



£. s. d. 

 Formation, the cost of the under-drains being slightly 



reduced 15 



Foundation, 2376 bricks, and carriage, at 20s. per 1000 2 7 6 



Laying same 3 10^ 



Covering of sifted gravel imported, 6 inches deep, 11 



yards, at 5s. per yard delivered : .. 2 15 



Spreading and finishing 02 9 



Total cost per chain 6 4 1 J 



The advantage of perforated bricks will be found to be two- 

 fold : first, in constituting a ready means of draining, and next, in 

 affording a matrix to fix the superincumbent gravel. 



In the clay districts of the two red sandstones and of the coal- 

 measures which succeed the lias, several of the descriptions of 

 roads already given will be found available. 



The red sandstone rock makes a very good paving for, or 

 foundation of roads, if properly laid on the Telford principle. It 

 should be well covered to prevent the sandstone being ground to 

 powder by the friction of traffic. It can be quarried to suitable 

 size at Is. '6d. per cubic yard. The conglomerate of the red sand- 

 stone formation also makes a good foundation, and the pebbles, 

 when broken, are an excellent covering ; but materials from a 



