ON THE IMPROVEMENT OF POTTERY. , ^91 



IX. 



Essays on the. Improvement of Pottery in general, or the Art 

 of making, at the least Expense, Vessels for every Use, 

 tnore handsome, strong, and wholesome, without employing 

 Lead or Tin, in the Composition of the Coating, Enamel, 

 or Glaze: by Mr. C. R. Jousselin, Manufacturer at 



, Nevers, An Abstract by Mr, GvYTO]<i*. \ 



JLN the pamphlet that has just appeared under this title, History of the 

 the author, after noticing- the importance of this branch of ^"^ ' 

 industry, takes a rapid view of the periods when the porce- 

 lains of Japan and China arrived in Europe, the introduc- 

 tion of Delft ware into France, which dates no farther back 

 than the 15th century, the extensions of the art which have 

 long rendered it an advantageous branch of foreign trade, 

 the importation of the white English ware, and manufacto- 

 ries established to imitate it. 



He next lays it down as an estaljlished principle, at least No good pot- 



amone men of science or those acquainted with the art, that ^'^"'^ butstone- 

 , V , , , 11- ware and por- 



there is no truly good pottery but stoneware and porcelam : cdain. 



as they are the only kinds, in which strength, neatness, and 



wholesomeness are combined. 



Before proceeding to the proofs of this, Mr. Jousselin importance of 

 justly observes, that this principle is not only interesting to the art to 

 the progress of the art; but that it merits the greatest at- 

 tention in a political and commercial view, particularly as 

 the neglecting it must render the French tributary to foreign 

 nations, and this to no small amount, were it merely for the 

 lead and tin employed in the composition of the coatings. 



Common pottery, intended to stand the fire, has a very r^j^rnon pot- 

 porous biscuit, which is but slightly baked, that it may be tery f >r culi- 

 oapable of sustaining the transition from heat to cold, and '^*'"y "'^^^' 

 because it is not refractory enough to support a greater heat. 

 For the same reason it can only have a very fusible covering. 

 This is commonly sulphuret of lead, and oxides of copper, . , 

 iron, and manganese. 



^ • Annales de Chimie, Vol. LXII, p. 213, Mai, 1807. 



U 2 Delft 



