1.56 On painting Linen Cloth in Oil Colours, 



as no more time could be allowed me, in consequence of 

 ships sailing. Mv plan was therefore to lay on the compo- 

 sition 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 after- 

 wards taken down and folded together in cloths, containing 

 sixty or seventy yards, they did not stick together. 



Having no means of giving information to persons con- 

 cerned in grinding colours, so well as through the medium 

 of the Society of Arts, &c. I beg leave further 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 mill* 

 employed for that 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 them. 

 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 other, 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 on 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 at the extremity are impediments. Necessity 

 was ttuly 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 the common way. 



Persons will scarcely believe, without seeing the experi- 

 ment, the ease with which they turn. If a little extraordinary 

 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. 



Portsea, May 6, 1807. 



To C. Taylob, M.D. Sec. 



SIB, 



