I3_>n 



ENCYCLOPEDIA OK AGRICULTURE. 



SUPPLEMENT. 



The pinion :t la kopt in its place on the shaft 2 by a key ; when tin: bone-mill is not at work, the pinion 

 it slitled along the- shaft clear of the wheel 4. 



There are three cogs dovetailed into the pinion !> ; when the chaff-cutting machine is not at work, 

 these CMS are removed, and the vacant part turned towards the bevel wheel 8; the person attending 

 the ctaalt-marhine can also stop it by the clutch and handle 16. 



To Itop the water-wheel, the ring and lever l« is raised by means of a chain leading over a pully at 

 the upper part of the building ; this raises the sluice board i7, and allows the water to escape clear of 

 the wheel. The water which drives the small wheel x is also conveyed by B dash-board under it on to 

 the large water-wheel ; ai this water falls above the centre of the large wheel, the loss of power sustained 

 is not great. 



The velocity of the particular parts is found by dividing the product of the number of cogs in the 

 driving wheels of the product by 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"S revolutions for one of the water wheel ; which, multiplied by 7, the medium revo- 

 lutions of the water-wheel per minute, will give 3444 revolutions of the drum per minute ; as the dia- 

 meter of the drum is three feet, the circumference will be 942 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 chair-cutting machine 

 The bone mill ... 



The operative part of erecting the machine was done by 

 Bagshot. 



8208. A flour mill for a parish workhottsc. upon a new and improved principle (figs. 1167. and 1168.), 

 has lately been erected at the Islington parish workhouse, by Weir, Oxford Street ; and as it is admir- 

 ably calculated for the purposes in view, and may be adopted in many similar cases, we have deemed it 



- 5-421 



- 10-7 



- 71 



- 26-6 



- 36-4 

 •52 J 



a Mr. George Millar, now residing near 



revolutions 

 for one of 

 the water- 

 wheel. 



well worth a place in this Supplement. 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 

 (Jig. 11G8.1, 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 (A), 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 an hour, and the work is performed in as perfect a manner as by any water mill 

 whatever. There is a bolting machine worked by a crank and fly wheel, and set in motion by 

 four men. The expense 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 in- 

 vention of Mr Malpas, the foreman at Weir's establishment, a very intelligent mechanic, and the author 

 of various improvements on the implements and machinery manufactured there, which do him the 

 highest credit. 



