COPYING DRAWINGS. 405 



glass put in a frame, and fitted up like a music- 

 stand, with a candle behind it. Lay your paper 

 over your drawing, and you will see all the lines of 

 the original distinctly through it, by which means 

 you can easily trace them with a pen or black-lead 

 pencil. 



To make Tracing-Paper. 



Mix together equal parts of oil of turpentine and 

 drying-oil, and with a rag rub it evenly over some 

 fan, or tissue paper, or any other very thin paper. 

 Hang it by to dry for a day or two, and it will be 

 fit for use. Lay this over the print or drawing 

 you want to copy, and you will see every line dis- 

 tinctly through, so that you can go over them with 

 the black-lead pencil. If you wish to do it in ink, 

 you must mix a little ox's gall with the ink, to 

 make the paper take it, which it would not other- 

 wise do on account of the oil. 



To make CampPaper. 



Take some hard soap, mix it with lamp-black; 

 make it into the consistence of a jelly with water; 

 with this brush over one side of your paper, and 

 let^ it dry. When you use it, put it between two 

 sheets of clean paper, with its black side down- 

 wards, and with a pin, or stick with a sharp point, 

 draw or write what you please upon the clean 

 paper; and where the tracer has touched, there 

 will be an impression upon the lowermost sheet of 

 paper, as if it had been written or drawn with a 

 pen. It may be made of any colour, * by mixing 

 with the soap black-lead, vermillion, &c. 



DP 3 



