IMPROVED MfFFLES. g'7'7 



well together with water, sons to form a mass of a pretty thick Description of 

 consistence. The tin mould being first greased, I place it in ,ijakjn« the 

 the frame, fig. 1.5, shown under fig. 1, and having spread the muffles. 

 composition in the meuld, and smoothed it with the spreader, 

 fig. 5, till the mould is quite full, the flat piece of tin is then to 

 be well greased, and thrust in at one end of the mould, and 

 the back of the muffle is then ftjrmed by spreading the com- 

 position, and firmly pressing it against the part already form- 

 ed. The next thing to be done is to cut the holes in the sides 

 of the muffle, which is done by pressing the semicircular cut- 

 ter, fig. 3, into the sides thereof, while it is yet wet, and bring- 

 ing the piece out entire: the tin mould must now have the 

 frame, fig. 4, put on, to keep the sides of the muffle from con- 

 tracting; and being set up endwise, and a little inclined, it 

 mu^t bfi dried in the sun, until it has shrunk sufficiently to 

 le9.vethe mould, after which it must be completely dried and 

 burned in the usual manner. 



The composition of the smaller implements, or muffle bot- 

 toms for dial plates, for the mould figs. Q and 10, is made of 

 the finer part of the Stourbridge clay, with a small propor- 

 tion of pipe clay. 



The rings are made from two parts of Dutch black lead 

 pots powdered, and one part of pipe clay. I have made re- 

 peated trials of English black lead, in various states, as a 

 substitute for the Dutch black lead pots, but without finding 

 it to answer properly. 



Should any difficulty appear in any part of my process, I 

 shall be happy in attending the committees, and performing 

 the whole operation before them, whenever chey shall be 

 pleased to appoint, when the great simplicity and advantage 

 jvill appear evident. 



I am, my Lords and Gentlemen, 



Your most obedient and respectful Servant, 



EDMUND TURRELL. 



No. 40, Rawstorne-street, Goswell Road, 

 April lOM, 180(). 



To the Members of the Society of Arts, &p. 



Certi- 



