Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 495
J X 7 ; they form a pavement 7 thick, withfilled with fine-screened gravel and grouted pitch. 7 X 3i X 7 to 10 X joints not over f wide, Before the joints are poured the blocks are rammed with hammers weighing from 75 to 80 pounds until brought to a firm bed at the proper level. The asphalted… … of sand or broken stone is thoroughly compressed with the roller to the exactform and crown of the finished pavement. On this foundation a layer ofbrick is laid flatwise, with the longest dimension longitudinal with the road-way; on this layer sufficient sand is spread to fill all joints and then…
Mechanical drawing
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