^•J^l. UNTWISTIKG MACHINE. l8» 



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Defcription of a Machine for Uniwijiing Tarn. 



VSee tbe Plate, which reprefents the Machine as viewed from 

 above. J 



A is the handle of a Avinch fixed on the axle of a reel, and 

 tefting on two fupports B B, into which it is let down about 

 an inch, but is open at top for the conveniency of allowing it 

 to be readily lifted out or put into the ftands at pleafure. On 

 the axle of the red is fixed a wheel c with teeth in its edge, 

 and pins D D on its fide : Thefe pins, when the reel is put in- 

 to motion, lay hold of the ribs of the trundle E, fo as to put 

 it in motion, and with it the flaeeves G, which are fixed on the 

 fame arbour. An endlefs therm-band being ftretched over 

 one of thefe fheeves, is made to go once round each of the 

 bobbins F F F, and then carried acrofs the Iheeve Gz, 

 and returned below, in the manner reprefented by an 

 end view of this part of the apparatus at Fig. 2. The 

 two Iheeves G and G 2 are fo formed that the band is equally 

 ftretched when put upon any one of the fheeves. When the 

 machine is put in motion, it therefore follows, that the bob- 

 bins FFF will be put in motion with a greater or fmaller 

 degree of rapidity, in proportion to the diameter of the Iheeve 

 G that the band goes upon. The axle of the bobbins F being 

 protrafted, is divided and bent into the form of checks, which 

 receive the pirns H H H * ; the thread being parted through a 

 hole made in its centre for that purpofe, which thread, in its 

 palTage to the reel K, is turned once round the bobbin I that 

 turns freely on its axis. Now, while the reel K, in revolving 

 round, pulls ofl' the yarn from the pirn H, the bobbin F, with 

 the pirn annexed to it, is turning rapid'y round, with a motion 

 reverfe to that which it acquired hi fpinniiig ; and confequent- 

 ]y that part of the yarn which is between H and I is unt wilt- 

 ing : and as this may be augmented or dimiiiifhed at pleafure, 

 when the machine is once let to the pitch tiiat is judged pro- 

 per, it mud go on till it be altered, untwilling every inch of 

 yam during the operation, precifely to an equal degree, whether 

 the reel go faft or flow. 



• By a trifling miaake of the ergravcr, a fmall addition 13 

 inadc at the end of each of the pirns improperly. 



