72 



cores. In this box, two semicircular or half cores are made, which, 

 after being dried, are pasted together, forming the cylindrical core 

 required. For the part a of the core box, a block of slightly greater 



length (i- inch or 1 inch) 

 is first planed up to the 

 exact size. A center line 

 1. Fig. 144. is drawn with 

 the marking gauge par- 

 allel to one of the edges, 

 and also extends across 



Fig. 144. 



each end of the block. 



From this center line, at a distance of yf inch on each side, the 



lines d and e are also drawn. Then with a second block, or strip 



of wood placed against the face of the block and flush with the 



end, the two pieces are clamped 



together in the bench vise, as 



shown in Fig. 145. Now with 



the dividers adjusted to -rl inch, 



describe on each end of the block 



the semicircle which will connect 



the lines d and e on the ends of 



the block. This wood may be removed rapidly with a gouge and 



mallet, smoothed with a round plane of proper size and curve, 



and finished by sand paper rolled on a cylindrical block having 



a diameter -^ inch less than the width of the required box. 



Fig. 146. 



Fig. 146. 



Another method frequently used for small boxes, is to work 

 out the center of the curve with a rabbet plane, forming a right- 

 angled opening, as shown in Fig. 146, the remaining wood being 

 removed with the round plane and finished with the cylinder and 

 sand paper as before. 



