PA VING. 



51 



yard are required, viz. 120, and they weigh 20 cwt. per 

 1000. The clinkers above described have a sandy surface, 

 and a very agreeable colour, varying between a pale yellow and 

 a deep orange. K brown Welsh pavior is also manufactured, 

 chamfered on all the edges for reversing, and measuring 

 8 inches by 2f inches by 2f inches ; 60 of these will cover one 

 yard super, and 1000 weigh 37 cwt. These are made of the 

 same size in 6 panels, with semicircular grooves, but in this form 

 they weigh only 36 cwt. per 1000. Other varieties of these 

 bricks are to be obtained, composed, it is said, of the identical 

 clay from which the Roman pottery and bricks were made, 

 most of them either chamfered or traversed by V or semi- 

 circular grooves as in Fig. 30. The latter, where laid in 

 a diagonal direction with a central groove, or open surface 

 gutter, are most easily kept clear. This is illustrated on 

 Plate 6, and on Plate 13, in the stall d. The grooves may 

 have a maximum slope of \ inch in their length, equal 

 to I in 96. Fig. 31 exhibits a specially splayed brick to 



Fig. 30. 



Fig. 31. 



avoid the difficulty and waste of cutting for this description of 

 laying. 



Paviors, with semicircular grooves crossing them diagonally, 

 are also made, to facilitate this method of paving, so that, 

 although the brick may be laid transversely with the stall, as in 

 A, Plate 13, the drainage will take a diagonal course towards 

 the centre. 



The grooves of a paving should not exceed 5 inches in 

 distance, from centre to centre; but where the smaller 



E 2 



