BODIES SUPPORTED IN TWO POINTS. 



Ill 



cold water for about half a day, until it swells, and then made liquid 

 by heating in a water-bath, that is, a vessel with double walls with 

 water between them, which thus prevent the overheating and burn- 

 ing of the glue. * Glue-pots ' of this kind made of cast-iron may be 



FIG. 80 (I real size). 



bought for a very moderate price at most ironmongers'. Glue should 

 always be used hot and very liquid, so as to obtain thin layers : 

 this is absolutely necessary for neat work. 



