PA VING. 59 



wooden surface thus formed was studded with nails having 

 heads of about \\ inch in diameter, and closely hatched to 

 form a foothold, 



Creosoted wood blocks, 9 inches long, 3 inches wide, and 6 Paving of 

 inches deep, may be recommended, however, as the paving of ^"^^^ ^' 

 that portion of a smithy on which the hearth is built, the 

 remainder, where the horses stand to be shod, being laid with 

 4-inch granite cubes, an open surface gutter dividing the two 

 portions from each other, as in Plate 50, where a dotted line 

 is shown indicating the boundary of the wood paving. The 

 blocks should be laid in parallel courses, breaking joint, and 

 spaced about half an inch apart, carefully cut and fitted, 

 and finally grouted with a mixture of boiled pitch and tar. 



