220 



THE AMBRICAIf MONTHLY 



[July 



7. Cut a piece of manilla paper to the size and shape 

 of sketch No. 1. Damp and glue it, and wraparound the 

 slide, folding the corners over neatly. 



None of the edges of these three thick papers (para- 

 graphs 5, 6, 7) must overlap, or the surfaces of the slied 



■\ 



Manilla paper, OJ by 1 in., par. C. 



Manilla paper, 3 by 2J in., p«r. 6. 



Thin gla.ss slip. par. 4. 



.Slip of wooa, par. 2. 



— Photo, bottom, oar. 3. 



-■ . ManillapaperasSketchl.par. 7. 

 -;;;-— Thin black paper „ l,par>M. 

 "• -^ Ditto ditto „ l,par. U. 

 Strip of thin ditto, par. 10. 



will be uneven when finished. Trim the papers to the 

 exact size when the liquid glue is on the paper. 



8. Glue on a strip of thin black paper (black tissue) 

 cut to the size and shape of sketch No, 1. Thin the glue 

 with a little water, just thin enough to prevent the paper 

 tearing when it is brushed on. 



9. Glue on a similar piece of black paper, cut as in 

 sketch No. 1, making them join on the opposite side of the 

 built-up cell. 



10. Cut a piece of thin black paper, 3 inches by 1, and 

 glue over the last-made joint. Press the finished slide 

 between two flat surfaces, such as a table and a piece of 

 smooth hard wood, to squeeze out all the air cells in the 

 moist paper. Put it away to dry for two or three days. 



11. When the cell is dry, cut out the centre of the 



