from the Pajle of Reddle. ^Ot 



The moulding may be performed two ways : the firft is, 

 to fprcad out the pafte on a board, in which are cut grooves 

 rather broader at the top and round at bottom ; and of 

 any length, fize, and depth, proportioned to the intended 

 lize of the crayons. The fecond, which is the better me- 

 thod, is to force the pafte through a pipe or funnel of an ori- 

 fice equal to the fize of the crayon. The pafte thus formed 

 may be left to dry {lowly in a cool place under the fliade, 

 in order to prevent cracks, which too hafty deficcation might 

 produce. When the rods are dry, they are to be cut into 

 pieces of the dcfired length : the edges muft then be taken 

 off; after which they muft receive the firft cutting, to gire 

 them a blunt point. The laft operation is to fcrape them, 

 in order to take off the hard outward coat formed on the fur- 

 face while they are drying, and which would prevent them 

 from making any marks. It may be neceflary to rub afmall 

 portion of oil Into the grooves of the wood, that the pafte 

 m.iy not adhere too clofely to the n^oulds. 



Gum arable and Ifinglafs are the two fubftanoes to be 

 preferred for mixing with the powder. It will be fufficient 

 to diflblve the gum and foap in cold water; but the ifinglafs 

 muft firft be cut into fmall pieces, then put into hot water, 

 and diilblvcd in halnco 7naricc. Thefe folutions fliouid be 

 well diluted with watc;-, tliat they may be made to pafs 

 through a hair fieve in order to remove any foreign particles. ' 

 As it is difficuU to incorporate the pafte with the ifinglafs, 

 they muft both be heated and mixed over a fire with a heat 

 equal to that of boiling water. The pafte muft be well mixed 

 before it is moulded, in order that it may be uniformly in- 

 corporated with the folutlon, and that there may not remain 

 nny hard lumps. The beft way would be to beat it with a 

 , -:ftle or mallet, and to pound it again for feme time before 

 it is put into the moulds. 



No foap muft be employed but for thofe crayons in which 

 £um is ufcd. In all the trials I have made with ifinglafs and 



foap. 



