22 



Laboratory Arts 



pieces, and cut out this circle 1 by means of a gouge, which should 

 be well sharpened, and sloped towards the centre, while cutting. 

 The blows given to the gouge should not be too heavy or, when 

 with the grain, the wood will probably split. There is not so much 

 likelihood of this in cutting against the grain. Having completed 

 a rough circle about f " inside the mark, gradually extend this out- 



PLAN 



ELEVATION END M 



FIG. 1 8. Plan and elevations of lantern cell. 



wards, holding the gouge vertically, until the circle is completely 

 and cleanly cut. Finish with the curved side of a half-round file. 

 Treat the second piece similarly. 



Plane up the 10" x 2" x J" strip and take &" off the width, 



FIG. 19. View of cell and plates. 



making it 10" x iff" x J" finished. 



Cut off from this two pieces, each 35" long ; glue both sides of 

 each of these strips ; place one of the thin pieces of wood on a firm 

 support, and fix the strips in place, each having two of its edges 



1 A special cutting tool is known to carpenters for this purpose, but 

 an ordinary " washer cutter" will do admirably. 



