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sized, which on being saturated with water expanded 3/4 of an inch to the post in every direction, I pasted this over my stretching frame and when dry it was like a drum.  The surface of this was moistened with diluted Venice Turpentine and warp, and instantly coated with tinted white lead diluted with Sp: of Turpentine.  When this was dry enough to be scraped and pumiced, it was oiled with drying oil and again painted; and so on to a third coat.  
   I have prepared some by pasting together two sheets of this paper, and then pasting them over the Frame.  I have also, to obtain a finer surface, pasted a thin paper to the thick__ the thick paper being wet, and the thin one only pasted and applied to it.  And then both extended on  the Frame.  The double thickness contracts with so much force as to twist the Frame a little, and, if not strong, to break it at the corners.  This paper appears as difficult to break or perforate as Canvas-- perhaps more so.  It may  be protected by a coat of wax on the back.
   In order to obviate the necessity of gluing together several thicknesses of Pasteboard, to procure a firm and level surface, I have devised this expedient, by using a simple thickness of good smooth Pasteboard. Cut the Pasteboard to the size of the Strainer (a fraction less) file the edges-- paint on one side of it and let it dry-- then having the strongly sized paper (before mentioned) after being expanded by saturation with water, coat it with good paste, and apply the unpainted side of the Pasteboard well to it-- Then lay the painted side of  the Pasteboard flat to the Frame and paste the paper over the edges and back of the Frame-- then lay it on its face on the floor that the edges may dry first.  As the paper dries it draws the Pasteboard level and tight, furnishing a surface and substance, when painted, as before directed, stronger than any canvas can be made.
    Pictures that are lined are thereby rendered strong and left liable to  become slack.  Wilkie sometimes painted on double Canvas.

        Fullers Boards
   These are large enough for a Picture 25 by 30.  I have prepared it thus