OF SILK. 243 



the degree of crofling is not accurately de- 

 termined. He adviies to encreafe it by- 

 making a double croffin^, and defcribes a 

 method both f>f doing this and determin- 

 ing tlie degree, or number of the times, 

 that the threads are crofled, in the follow- 



ing manner. 



A wooden rins" marked A. Plate 11. Fis;. 

 II. is made three quarters of an inch in 

 thicknefs, and one inch broad, its inner 

 diameter is fix inches and an half. Its 

 outfide rim has a groove for the reception 

 of a band, f. f. this ring is placed betv/een 

 three little wooden rollers b. b. b. which 

 turn on pins fixed in a fquare frame of 

 wood, c. c. c. c. the frame is nxcd by the 

 pin e. which comes from its lower fide in- 

 to a hole, Z. which is bored in the mid- 

 dle between S and R in the reel's bench. 

 Fig. I. the band Vv^hich goes in the groove 

 of this ring goes alfo round a groove in a 

 wheel I. of the fame fize, which turns on 

 a pin going thro' its center into an upright, 

 i. i. which is failened in a hole to fuch a 

 part of the reel's bench, R. where it can 

 moft conveniently be reached by the hand 

 of the fpinner, who fits by the cauldron, 

 R 2 and 



