1280 



SUPPLEMENT. 



not at work these cogs are removed, and the vacant part turned towards the bevel wheel 

 8; the person attending the chaff-machine can also stop it by the clutch and handle 15. 

 To stop the water wheel the ring and lever 1 8 is raised by means of a chain leading 

 over a pully at the upper part of the building ; this raises the sluice board 1 7, and allows 

 the water to escape clear of the wheel. The water which drives the small wheel t is 

 also conveyed by a dash-board under it on to the large water wheel ; as this water falls 

 above the centre of the large wheel, the loss of power sustained is not great. 



1141 



I I I I 1 I I I I I I I I II I I IT \ 



M I i \ ^A 



The velocUy of the particular parts is found by dividing the product of the number of 

 cogs in the driving wheels by the product of the number of cogs in the driven wheels, 

 and' the quotient will be the number of revolutions made by the last moved part, for one 

 of the first moving part. The drum will, therefore, make 49-2 revolutions for one of 



