Practicaltreatis 00 Pattrich
2018-4-3 · ' 6 gravel and pebbles from sea-shore, 12 bbls.; ' 9 broken stone, > 26 per cent) of voids. Producing 50 feet of rammed concrete. This concrete is of being compact, free from voids, and strong. first-rate quality, It is richer in mortar than would be necessary for most pur-poses.'
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