On painting Linen Cloth in Oil Colours, 3 



is to be formed of the same proportion of English ochre an J 

 black, without any soap solution ; and the third or finishing 

 coat, to be done with black paint as usual. 



I am, sif, your obedient humble servant, 



Wm. Anderson, 



• Master Painter of H. M. Dock- Yard 

 Portsea, Oct. SI, 1806. at Portsmouth. 



SIR, 



A.GREFARLY to the request in your letter, I have enclosed 

 certificates relative to my new method of painting canvass; 

 and I take the liberty of informing you of a method of ob- 

 taining from painted canvass, unserviceable, the whole of 

 the colour laid thereon, and to do it at a very small expense. 

 This J discovered since T last wrote to you, and I believe it 

 will be of considerable advantage to government, who, for 

 want of such a thought, have buried and burnt immense 

 quantities of ships' hammock cloths, when found unser- 

 viceable, to prevent embezzlement from taking place. I 

 suggested the idea to N. Diddems, esq., builder of Ports- 

 mouth yard, who communicated it to the honourable George 

 Grey, commissioner. I obtained leave to make an experi- 

 ment, which I repeated thrice, and found that from one 

 ton of painted canvass, unserviceable, I obtained, upon an 

 average, four hundred weight of dry colour, in value to 

 government nine pounds six shillings ; the expense of the 

 process not exceeding six shillings. 



This I effected by calcination, raking aside the ashes and 

 sprinkling them with water, to prevent loss of paint through 

 excess of heat. By passing the calcined matter through a 

 line sieve, it is perfectly prepared i >r grinding j it grind* 

 well, possesses a good body 1 >r covterii j* wHh£ and dries 

 well with a good gloss. Its increase ot btiik, in comparison 

 with common colour of equal weight, gives it the advantage 

 of covering more work. The colours yi<- Jed by the calci- 

 nation or di Herein coloured canvass are as follow : viz. Can- 

 vass which has been painted with black paiut only, produce* 

 a black colour. Canvass finished black, but which has had 

 a previous red or yellow ground, will produce a dark cho* 



colate 



