CALICO-PRINTING 



055 



pressure, and after ono hour the pressure increased, until at last a pressure of about 

 7 Ibs. is given. 



Mousseline-do-laines are treated somewhat in the same manner, the preparation of 

 the cloth being different, and the colours are made in such a manner as to fix 

 pqually on both the wool and tho cotton of tho fabric. The steaming and washing-off 

 are nearly the same as for calicoes. The following is the method in detail : 



The cloth is first well bleached and sulphured. This operation is usually per- 

 formed by hanging tho goods in a close stone or brick chamber. Trays of sulphur 

 being lighted, the door is closed tight, and the pieces stay in tho sulphurous gas for 

 several hours, and are then removed and washed. An improvement on this method 

 \vas patented by John Thorn, and is here shown. 



Thorn's Sulphuring Apparatus. Fig. 388. A is the roof, made of sheet lead, 4 Ibs. to 

 tho foot. B is a lead pipe, of one inch diameter, taking off the excess of sulphurous acid 

 to tho flue, c and c are rolls of pieces, going in- on one side and coming off at the 

 other. D and D, rollers of wood, three inches in diameter, with iron centres at the 

 ends. K and E, tiles, as in malt kilns, to let tho gas pass up through to the cloth. 



Fig. 389 shows the chamber : it is six feet in length by four feet in breadth, and about 



