[SEPTEMBER 13, 1873. 162 THE LARGE FLOATING DERRICK. pages, a derrick, capable of lifting a block ($2,250) another of 1,000 thalers ($750)— … are of channel iron three quarter inch heating effect equal to that obtained by thick; the side plates, which are riveted 11b. of coal. Ithas been ‘argued that to them, are three eighths inch in thick- the mode of separation was of the great- other authority on the subject states that the amount of…
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