( 130 ) 



" lution every ftroke ; the circular motion 

 beginning as the bit enters, and continues 

 until it is clearly difengaged from the 

 mould. The dibbles muft come out clean, 

 and wear bright, or the operation is not 

 perfea. 



" Another difficulty in dibbling is to make 

 the holes at equal diftances ; more efpeci- 

 ally, to keep the two vows ftraight and 

 parallel with each other : For the dibbles 

 being two diftinfb inftruments, it requires 

 fome practice to guide them with preci- 

 fion, fo as to pierce the flag in the exadl 

 point required. To remedy this, couples 

 have been invented to keep the dibbles .at 

 a given diftance ; but tliis renders the in- 

 ftrume* t complex, and prevents the learn- 

 er from ever being able to ufe them fingly. 

 A man muft be awkward indeed, if he does 

 not in a few days, without this incum- 

 branee, make himfelf a tolerable matter of 

 dibbling. 



" A middling workman will make two 

 motions or four holes in a fecond. 

 " One dibbler employs three droppers ; 

 therefore one man and three children are 

 called a fet. Each dibbler takes three flags. 



" which 



