40 



ELEMENTARY WOODWORKING 



The dry glue in the form of chips must be dissolved 

 in water and heated, being applied while hot. Liquid 

 glues sold in cans ready for use are now very common 

 and require no heating. 



In making a glued joint it is usually necessary to hold 

 the pieces tightly together until the glue has net, or hard- 

 ened, and as this takes some time, hand screws built on 

 the principle of the vise are resorted to. Fig. 52 shows 



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1 



Ml 



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"m^m 



: .. Fig. 62. MjUkuI of using the Hand Screw 



two pieces glued together and fastened in a ^•aat of 

 hand screws. Care must always be taken to keep the 

 jaws of the latter i^arallel. At a this is shown done 

 pro|)erly, while at & is shown a careless method which, 

 of course, will spoil the joint. 



In gluing on the end grain a preliminary, or sizing, 

 coat of glue must first be made to fill up the pores, 

 which act very much like a sponge. This coat should 

 be allowed to dry, or partially dry, before applying the 



