20 DOUBLE MULTIPLIER. 



speed of the barrel will be nearly four revolutions for 

 one of the winch. It will be seen by a reference to the 

 annexed figure, that the only difference between this and 

 the ordinary multiplier is, that the stout brass plates 

 enclosing the mechanism at the right hand end of the 

 reel are extended, so as to admit of both a larger pinion 

 and winch-wheel, by which the working of the whole is 

 rendered both smoother and less liable to clog, a a, 

 Brass plate ; 5, winch-wheel ; c, pinion upon end of 

 barrel. The winch-handle is fixed on the axle e. 



A very rapidly acting Double Multiplier may be 

 constructed, by allowing Fig. 4 to represent the wheel 

 and pinion, in their proper position, in their case on the 

 left end of the reel ; while their position in the right 

 end, to which the winch-handle is attached, must be 

 reversed viz., the winch-wheel, &, must be fixed on an 

 independent axle (which may work upon a pivot, inserted 

 in a socket drilled in the upper end of the barrel axle), 

 in the place occupied by the pinion c, Fig. 4 ; while the 

 pinion c must be placed on the end of the axle e, which 

 axle must extend across the reel, and sustain the driving- 

 wheel &, at the other end ; the winch-handle being in 

 this case fixed upon the independent axle d, in the centre 

 of the reel. Thus both ends of the reel will be alike, 

 each containing a wheel and pinion, with an axle be- 

 tween ; and the parts at each end projecting above the 

 circular portion of the reel may be strengthened by 

 connecting bars between, the same as those around its 

 circumference. By the multiplying effects of a wheel 

 and pinion at each end of the reel, we will gain sixteen 



