by means of a stern propeller. cal force to put it into service. The power-transmitting This apparatus can be carried: (knocked down) on capacity depends upon the coefficient of friction be- board a man-of-war, taking up less room than 60 cu- MAGNETIC CLUTCH CAPABLE OF TRANSMITTING tween the two… … together they induced as surprising as the large Congress to appropriate amount of tractive pow- $30,000 for the expense
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