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Scientific American, Vol. 12, No. 44 (1857) (1857)

leaf 7

An illustration from Scientific American, Vol. 12, No. 44 (1857), 1857, leaf 7
out about minerals, in the outer or inner edges of the wide part of consequence of the large quantity of lead being the blade, the proper construction of the hub got out of a mine near Placencia Bay, belong- and of the arms connecting the broad blades ing to the New York, Newfoundland and Lon-… … “EPORTS OF U.S. PATENTS granted are also pub- the destruction of the stuffing box due to the pitch of any ordinary screw, means simply their friction tend, without further assistance, listed every week, including Ofictal Copies of all the unequal balance of the propeller. With the PATENT CLAIMS.…

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