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A Method of making Type Slides for Opaque Objects with 

 Removable Cover. 



By D. Bryce Scott. 



{Read hy A. Earland, January 20th, 1899.) 



The first step is to prepare the photographed bottom on which 

 the objects are fixed. This can, of course, be prepared to any 

 size or pattern, according to the requirements of the mounter. 

 For my own purposes I prepare a slide having its surface divided 

 into 300 spaces of varying sizes, which is constructed thus : — 



1. Take a piece of black cardboard 32} inches long and 11^ 

 inches Avide. Scale off 20| inches into 25 divisions lengthways, 

 then scale off 6 J inches downwards into 12 divisions, making the 

 first division downwards the same breadth as the 25 divisions 

 along the top, which will thus become squares. Gradually 

 reduce the size of the remaining divisions downwards, until those 

 in the last line are only J the breadth of those in the top line. 

 Then number the spaces in the corner from 1 to 300. All the 

 lines and figures are to be made with china white, dissolved in 

 water, with sufficient gum added to make the white adhere 

 when dry. 



Photograph down to f of an inch wide and 2 y^^- inches long. 

 The printed photos are next pasted upon ordinary portrait photo 

 cards, and burnished. They are then varnished by pouring a 

 thin filtered solution of shellac over them, and allowing it to 

 dry. Unless this is done the slightest scratch will show on the 

 photograph, which is very delicate, and will not stand much 

 rough usage. The shellac preparation used by photographers 

 to pour over tin types will be found best for the purpose, as 

 it dries very quickly. 



Out the cards on which the photos are mounted to the standard 



