26 



as to prevent its being untwisted by the 

 action of the instrument ; for should one of 

 the threads be improperly placed, it will 

 require an encreased degree of labour, and 

 a neat line can never be produced. 



The hairs, in proportion to the thickness 

 of the line required, must next be intro- 

 duced by means of small quills into the 

 tubes, and twisted (perhaps two or more) 

 with each end of the silk ; when these 

 lengths are twisted in, the quills must be 

 taken out, and the tubes again fed with hair ; 

 and so on, until the whole of the silk be 

 unwound from the balls. It is necessary to 

 observe that the hairs should be of unequal 

 length when introduced ; otherwise, should 

 it, after the commencement, be necessary to 

 put in two hairs at one time, the line will 

 be clumsy and uneven. 



By immersing the hair for about ten 



