I'jgi- HINTS TO MANTJFACTURERS. JI 



be applicable to wool, it is neceflary to adopt fuch alterations as 

 the nature of the materials require. Aimed; every oerfon, I 

 fuppofe, nov/ knows that this machine confits of a large cylin- 

 der of wood, upon which is fixed a gtczt rcany cards of the 

 ufual kind and fize that had been ufed for carimg cotton wool, 

 with blank fpacas between, of fuch a breadtli -is- that the cot- 

 *ton wool which adheres to the one card cannot rerich the other, 

 fo that the roivy when call, falls down without bein^ entangl- 

 ed; but the fhorteft wool of flieep is longer than cotton, and 

 many kinds of wool, that may be carded, are three or four 

 times its length ; it follows, that unlefs the blank fpaces be- 

 tween the cards be made much larger than is neceflary for cot- 

 ton, flieeps wool would reach between one card and another (6 

 as to adhere to both, which would occafion the ro'w of one 

 card, when call:, not to fall ofl' freely, but to be entangled with 

 the other. To avoid this evil, the cards fliould be placed on 

 the cylinder at fuch a diftance as to prevent the longeft wool 

 that is intended to be carded from reaching acrofs the fpace. 

 "With this flight alteration of the machine, and adapting the 

 teeth of the cards to the wool to be employed *, there is no 

 doubt but wool may be carded upon this machine as perfedtly 

 as cotton. If it cannot be roved on the machine, of which 

 fome doubts are at prefent entertained, the expence of that ope- 

 ration by band is very trifling, fo as not to be much worth re- 

 garding. 



In drawing the thread, however, a different mode of mariipU' 

 lat'ton t becomes neceffary between cotton and wool, in order to 

 adapt each of them mofl perfeftly to anfwer the purpofes to 



• The teeth of wool cards muft not only be longer and more 

 bent than thole for cotton, but they muft be differently arranged, 

 as every card-maker knows ; fo that to give more particular 

 diredions for thefe here would be fuperfluous. 



t This is rather an unufual term, but it ought to have a place in 

 our language, becaufe we have no word entirely equivalent to it 

 Procejs applies, in ftrift propriety, to chemical operations only. 

 Manipulation in like manner applies, in ftri<ft propriety, to me- 

 chanical operations alone. Operation is a general indefinite term, 

 that has no reference to any particular refpedting the nature of 

 the bufinefs. 



