Woodworking 1 Woodwork Exercises 



21 



en 



-6- *);-$" 



FIG. 17. 



When the holes are drilled and countersunk, the drill may be 

 put down each hole in turn while the vulcanite is being held in 

 place on the wooden base, thus mark- 

 ing the positions of the holding screws. 

 The base is then removed, and a 

 bradawl or gimlet is used to make 

 a hole in the wood big enough to 

 ensure the screw taking up its right 

 position. This will be the case if the 

 hole is J" deep, and exactly vertical. 

 Replace the vulcanite plate, and in- 

 sert the screws, taking care to push 

 them well home, and level with the 

 top of the plate, but not so far as to 

 strain the vulcanite unduly. 



Note that the gimlet is not to be put through the vulcanite 

 plate to reach the wood this would probably result in cracking 

 off the corner of the vulcanite plate and that the holding- 

 down screws, while tight, yet must not produce a compression 

 strain on the vulcanite, and must be level with the top of the 

 plate. 



The above exercise looks very easy, but care will be required 

 to complete it correctly, as no glass-paper must be used on the 

 face of the vulcanite, which indeed scratches very easily, and is 

 thus ruined in appearance. The exercise is one involving delicate 

 handling as well as accurate work. 



EXERCISE 3. Lantern cell in mahogany ', or cedar. 



Materials required: An empty cigar box (100 size) ; mahogany 

 strip, 10" x 2" x J" ; brass escutcheon pins or veneering pins ; 1 

 two glass plates, 2 4" x 3^" ; one foot " I.R. tubing. 



Tools required: Plane, chisel, hammer, trysquare, glue. 



Method: Take the cigar box to pieces carefully and select the 

 best sides to give two pieces 8" x 4". Draw a circle 3" diameter 

 centreing at the intersection of the diagonals of the two 8" x 4" 



1 Failing these, use nails from the cigar box itself. 



2 These 4" X 3%" glass plates should be of "patent plate" glass with 

 optically true surfaces. Such glass is about ^" thick. Failing this, 

 ordinary "|-plate" stripped photographic plates will do, but the cell will 

 suffer in consequence, there not being quite enough overlap of wood to 

 render it thoroughly water-tight, unless the dimensions are suitably altered, 

 and a smaller "field " used. 



