168 D. B. SCOTT ON TYPE SLIDES FOR OPAQUE OBJECTS. 



size, 3 inches by 1 inch, taking great care to ensure that the 

 background is exactly centred on the card. 



2. Take a slip of dry and well -seasoned bay wood or mahogany, 

 3 inches long, 1 inch wide, and y\- inch thick (thinner or thicker 

 if required). Glue over the strip on each side a piece of manilla 

 paper of good quality, using liquid glue, and dry under a flat 

 weight. - -. 



When dry cut out the centre of the wooden slip, leaving a strip 

 g inch wide on each side, and -^ at each end. Smooth down 

 all roughnesses with fine glass-paper, and blacken all over with 

 lamp-black in alcohol. Add sufficient shellac to the alcohol 

 to make the lamp-black adhere to the cell, but not enough to 

 make a gloss. 



3. Glue the photographed bottom to the wooden cell with 

 liquid glue, and dry under a flat weight. 



4. Place a thin glass slip, 3 inches by 1, of best quality, with 

 ground edges, on top of the cell. 



5. Take a slip of good manilla paper, about 3 inches long by 

 2|- inches wide, moisten with a sponge, wrap it round the cell 

 and glass slip, and glue the edges on the back of the photographed 

 bottom. Be very careful that no glue touches the glass cover. 

 All the manilla paper used in the preparation of the sUde must 

 be damped but not soaked ; the damp paper stretches and works 

 better. 



6. Take a strip of manilla paper, 1 inch by about GJ inches 

 long, damp and glue it, and paste over the last strip. This strip 

 will go right round the long diameter of the slide. No glue 

 must be allowed to touch the glass cover where the paper goes 

 over it at the ends. 



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

 No. 1. Damp and glue it, and wrap round the slide, folding the 

 corners over neatly. 



None of the edges of these three thick papers (paragraphs 5, 

 6, 7) must overlap, or the surfaces of the slide will be uneven 

 when finished. Trim the papers to the exact size when the liquid 

 glue is on the paper. 



