SUPPLEMENT. 



1281 



the water wheel ; which, multiplied by 7, the medium revolutions of the water wheel 

 per minute, will give 344 '4 revolutions of the drum per minute ; as the diameter of the 

 drum is three feet, the circumference will be 9*42 feet, which, multiplied by 344*4, will 

 give 3244 feet, the velocity of the beaters or switchers on the drum per minute. By 

 following the same rule 



The shakers will be found to make 

 The feeding rollers, quick motion 

 slow motion 

 The upper stone of the flour mill - 

 The chaff-cutting machine - 

 The bone mill - - - 



revolutions 

 for one of 

 the water- 

 wheel. 



The operative part of erecting the machine was done by a Mr. George Millar, now 

 residing near Bagshot. 



2551a. A flour mill for a parish worhhouse, upon a new and improved principle, 

 {,figs. 1142. and 1143.) has lately been erected at the Islington parish workhouse, by 



Weir, Oxford street ; and as it is admirably calculated for the purpose in view, and may 

 be adopted in many similar cases, we have deemed it well worth a place in this Supple- 

 ment. It consists of two pairs of stones ; one pair of which can be worked separately 

 by six men, or both together by twelve men. The moving power is a crank {fig. 1 143.), 

 on the spindle of which is a large fly wheel ; and beyond which is a pinion, working 

 into a spur wheel on an upright shaft : this last wheel works into the pinions on the 

 spindles that set the stones in motion. Either of the pinions is of course easily thrown 

 out of gear by a lever. 



There is a hopper (a, a) to each pair of stones, and one governor (b) which, by means 

 of steel yard bars (c, c) reaching to each pair of stones, regulates their motion. Each 

 pair of stones grinds a bushel and a half of wheat ah hour, and the work is performed in 

 as perfect a manner as by any water mill whatever. There is a bolting machine, 

 (see 2552.) worked by a crank and fly wheel, and set in motion by four men. The ex- 

 pense of a flour mill of the above description depends chiefly upon the size of the burr 

 stones ; these when large being very expensive. The improvements in this machine 

 are the invention of Mr. Malpas, the foreman at Weir's establishment, a very intelligent 



4N 



