...— the hardest — in thick layers, in native bed 200 Rock, equal to best ashlar masonrv 25 15 3O 20 Rock, equal to best brick masonry Rock, equal to poor brick masonry . . . 5 4 10 Clay, in thick beds, alwavs drv . ... . 6 Ciay, in thick beds, moderately drv ... . . .... 2 4 Gravel...

...Material. Rock — the hardest — in thick layers, in native bed . Rock equal to hest ashlar masonry Rock equal to best brick masonry Rock equal to poor brick masonry Clay on thick beds (always dry) Clay on thick beds (moderately dry) Clay, soft Gravel and coarse sand,...

...Material. Rock, the hardest — in thick layers, native bed .... Rock, equal to the best ashlar masonry Rock, equal to best brick masonry. . . Rock, equal to poor brick masonry Clay on thick beds always dry Clay on thick beds moderately dry. .... Clay soft Sand compact and well...

...Kind of Material. Rock, the hardest, in thick layers in native bed Rock equal to best ashlar masonry Rock equal to best brick masonry Rock equal to poor brick masonry Clay in thick beds, always dry Clay in thick beds, moderately dry Clay, soft Gfuvcl and coar-* sand,...

...Minimum Maximum Rock (the hardest) in thick layers, in native bed .... Rock equal to best ashlar masonry Rock equal to best brick masonry Rock equal to poor brick masonry Clay on thick beds, always dry 200 Clay on thick beds, moderately dry .... . . Clay, soft . . 25 15...

...thick layers, in native bed .... Tons per aq. ft. Minimum 200 Rock equal to best ashlar masonry 25 Rock equal to best brick masonry Rock equal to poor brick masonry Clay on thick beds, always dry 15 5 4 Clay on thick beds, moderately dry 2 Clay soft Gravel and coarse...

...Material Rock — the hardest — in "thick layers, in native bed Rock equal to best ashlar masonry Rock equal to best brick masonry Rock equal to poor brick masonry Clay on thick beds, always dry Clay on thick beds, moderately dry Clay, soft Gravel and coarse sand,...