for j^rihding Painters' Colours. 179 



The colour al!>o was much more to niy satisfaction than In 

 the former wav, and attended with less waste. 



I have mentioned the pulverizing the colours in a covered 

 mortar^ which would prevent waste, and prevent the dust 

 and finest parts of noxious colours from heing injurious to 

 the grinder. In some manufactories, where large quantities 

 of colours, prepared from lead, copper, and arsenic, are 

 used, this precaution is particularly necessary. I do not 

 iiican to say that my machine is intended to supersede the 

 paint mill now in use for coarse common colours. It is 

 intended for no such purpose ; but to supersede the use of 

 the very awkward and uinnechanical marble slab now in 

 use, and on which all the colours for china manufactories, 

 coach-painters, japanners, and colour- tnanufacturers for 

 artists, &c. &c. are now ground. 



Several of the colour- manufacturers have expressed to me 

 their great want of such a machine ; and that I had no de- 

 sire of troubling the public with a machine that would not 

 answer, is evident, from my having used it several years 

 before I presumed to recommend it t'o their attention. 

 Being therefore now completely convinced of its utihty, 

 and hoping that it might relieve a number of my fellow- 

 creatures Irom a dangerous employment, I have ventured to 

 commit it to the protection of the Society of Arts, hoping, 

 through their means, to see its ultimate success. And, 

 further to give the society the most complete assurance in 

 jny power, I have aimexed the opinion of a very ingenious 

 and mechanical friend of mine, who has frequently seen it 

 work. If any other questions should occur to the commit- 

 tee, that may be in my power to explain, I.shall gladly do so. 

 I am, sir, your most obedient servant, 



James Rawlinson. 

 Charles Taylor, Esq, 



P. S. When the colour is ground, I recommend the fol- 

 lowing mode of tying it up in bladders, in preference to the 

 usual method. Instead of drawing the neck of the bladder 

 close, in the act of tving it insert a slender cylindrical stick, 

 and bind the bladder Olose around it. This, when dry, will 

 form a tube or pipe, through which, when the stick is with- 

 drawn, the^i)lour may be squeezed as wanted, and the neck 

 again- irlo'sed by rephicing the stick. This is not oaly t 

 neater and much more cleanly mode than the usual one of 

 perforating tlie Ijjaddev, and stopping; the hole with a nail, 

 or more comnionly leaving it open, to the prejudice of the 

 M ii colour ; 



