may be adjusted. The advan- Patented by H. K. Stevens and 8S. Miller, September 16, _ 1 8 tages of the device are that it prevents the rattling of the 1878. For further particulars address the manufactyrers, THE HERCULES SCREW PROPELLER. slats by the wind, and enables them to be kept with the pitch… … both may be controlled by the single device. rudder to the free passage of the water fromthe screw, caus- Patented through the Scientific American Patent Agency, The raft, which cost $500, and is capable of holding one ing a loss, it is estimated, of from eight to ten per cent of February 2, 1875.…
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