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6th February, i< 



The President, R. L. Patterson, Esq., in the Chair. 



A Paper was read by Mr. Wm. H. Patterson, M.R.I.A., on 

 ETCHING ON COPPER. 



Having enumerated the various ways of engraving on metal 

 plates for the purpose of producing printed impressions, Mr. 

 Patterson described more particularly the process of etching on 

 copper. Ordinary etching, in the different positive and nega- 

 tive manners, was described, as well as soft ground etching, 

 aquatint, &c. Copper plates were exhibited in various states, 

 with prints from the same ; and some of the needful utensils of 

 the art were shown. Mr. Patterson showed a series of printed 

 etchings, from plates which he had completed, printed in 

 different coloured ink, &c. 



