378 IMPROVED METHOD 01" PAINTING CANVAS. 



has not been hung up for painting and drying more thaa 

 one week, as no more time could be allowed me, in conse- 

 quence of ships sailing. My plan was therefore to lay on 

 the composition the first day, to coat it the second day, 

 and leaving one intermediate day, to finish it on the fourth. 

 Three days were then allowed it to dry and harden, and 

 when afterward taken down and folded together in cloths, 

 containing sixty or seventy yards, they did not stick to- 

 gether. 

 Saving of three Having no means of giving information to persons con- 

 labo^i lhC ccrne d m grinding colours, so well as through the medium 

 colour-grind- of the Society of Arts &c, I beg leave farther to relate how 

 "¥• I have, for the last three years, saved the labour of three 



men out of four in grinding colours with the common mills 

 employed for this purpose. One mill has ever been con- 

 sidered sufficient for a man to turn, whereas one man can 

 now, with perfect ease, turn four mills ; this is effected by 

 placing two mills on each side of the winch, so close as 

 only to leave room for the fly wheel to play between thera. 

 The spindles of each on either side are locked together by 

 a small iron collar, with a pin passing through it. The 

 distance of the mills thus paired from each, in order for 

 the man's standing between them to turn, is two feet six 

 inches. The distance of the arms of the winch screwed ou 

 the end of the spindles on either side is two feet two 

 inches ; the length of the arm is one foot six inches from 

 the spindles to the bar across which the man clasps in order 

 to turn. 

 Fly wheels. Fly wheels at the extremity are impediments. Necessity 



was truly the mother of invention to me in this case, as I 

 had great demand for paint, and I was not allowed men 

 sufficient for the work in jthe common way. 



Persons will scarcely believe,- without seeing the expe- 

 riment, the ease with which they turn. If a little ex- 

 traordinary motion is first given them, and they are then 

 left alone, they will continue to go round sixteen times; so 

 that a man with one hand may turn them. 

 I am, Sir, 



Your obedient humble Servant, 



Wm. ANDERSON. 

 SIR, 



