37 



feading wheel A, has twenty- eight teeth, and the smalt 

 counter- wheel B, has but nine ; consequently, the latter 

 will be carried round three times- by one turn, of A, which 

 is fixed to the winch : the extra, or twenty-eighth tooth,., 

 on the leading wheel, is added merely to prevent the 

 teeth of the two wheels from always falling into the sams 

 places in their revolutions, which would in time create a^ 

 false movement, as is known to all mill -wrights. 



Now, the counter- wheel B, is fixed on the same square 

 arbor with C, another wheel with twenty- eight teeth y 

 which, being carried round with C, turns the small 1 

 wheel D, having only nine teeth, making it revolve three- 

 times for every tuni taken by C. 



The wheel D is fixed on the square end f the barrel;,, 

 and consequently winds the line ; which, as the wheels 

 A and D move the same way, must wind in the same 

 direction as the winch moves, i. e. with the sun when 

 taking in, and against it when running oiF. 



The wheel A being fixed to the winch, is supported 

 exteriorly by the end-plate ; but, at the other side, is kept 

 in its proper situation by means of a gudgeon, moving in, 

 a round socket made in the centre of the little wheel D, 

 r, rather, in the centre of the barrel -axis. 



As both A and D move the same v/ay, there is less- 

 friction within the socket above described, than would be 

 the case were they to turn oppositely. This- reduces the 

 friction from ten. to eight, i.e. one- fifth. For the sake 

 of strength, though the large wheels may be of brass, the 

 small ones should be of steel. 



With regard to the ratchet and spring used in the 

 ordinary multiplier, it will be 'unnecessary in my com* 

 $ound multiplier y because tlie work will steady itself 



suiHci- 



