[ 342 ] 



Art. XXIX. 



A Method of preparing Canvas-, fo as to make 

 flexible Tubes for conveying frejh air into CoaU 

 Mines -f and for other ufeful purpofes. 



[By Mr. Lansdown.] 



*" I ^AKE one quart of boiled linfeed oil, and a quar- 

 -*- ter of a pound of the gum elafticlc — boil them 

 gently together — they will fo boil near two hours 

 before the gum will be diffolved. Then add three 

 quarts more of boiled oil, one pound of refin, one 

 pound of bees-wax, and one pound of litharge of 

 'ead — boil all up together, and with a brufli lay it 

 warm, and evenly, as a coat, on the canvas. 



This prepared fubflance will be as flexible as can 

 be wifhed, without cracking — will refiH: wet or damp, 

 and will be found durable, if common prudence be 

 exercifed in the care of it. 



HENRY LANSDOWN, 

 Metis, 1795^ 



5!f<4Sl0.rKKSJy 



Art, 



