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machine for crushing pieres

Data on Crushing Strength. Watertown Tests. Experiments made with the testing machine of the U. S. Arsenal at Watertown, Mass., gave the results in Table 53, page 316. The bricks were quite strong, averaging from 13,000 to 15,000 lb. per sq. in. tested flatwise between steel. The piers were built by a common mason, with only ordinary care and ...

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