Proceedings of the Society of Arts. 41 3 



Leakage in Steam-boilers, particularly applicable to the Boilers of Steam- 

 vessels while on a voyage. By Robert Hay, Esq. R.N. Communicated 

 by Dr James Weir, M.S. A. A working Model of the apparatus was ex- 

 hibited. (602.) Referred to a Committee. 



2. On the composition of a very firm Lute for the joints of Steam- 

 pipes, &c. By the same. Communicated by Dr Weir. The lute was 

 shewn, and its composition given. (603.) Referred to same Committee. 



These communications excited considerable interest ; and the general 

 impression seemed to be, that although only useful in peculiar situations, 

 the method is valuable as an additional expedient, to be ready for emer- 

 gencies. 



3. On Assaying Copper, and other Ores, by Galvanism. By Martyn 

 J. Roberts, Esq. of Wales. Communicated by Dr D. B. Reid, F. R. S. E, 

 M.S. A. The apparatus was exhibited. (611.) Referred to a com- 

 mittee. 



Some remarks were made on this process by Mr Ponton, who seemed 

 to fear that the whole of the salt of copper might not be decomposed, 

 and who mentioned arrangements by which he had decomposed the last 

 particle of salt. Mr Roberts, however, stated that he had put the solution 

 to the severest test, and had found none of the salt undecomposed ; and 

 further, that his new process had been adopted with much success in 

 Wales, and was preferred to the old methods. 



4. Description of a new Waving Bar for Engravers' Ruling Machines. 

 By Mr Edward Sang, F.R. S. E., M.S. A., civil-engineer and machine- 

 maker, Edinburgh. The Machine was exhibited in action. (615.) Thanks 

 voted. Referred to a Committee. 



The chief novelties In this apparatus were the substitution of a cylin- 

 dric waving bar, easily removable, for the usual flat one, by the turning 

 of which, changes in the pattern might be produced, — and a combination 

 of levers for altering the depths of the undulations. Specimens of work 

 done by it were distributed among the members. 



6. Donation. — The authorized Version of the Psalms of David in Metre, 

 embossed for the use of the Blind. In 2 vols. Glasgow ; printed in the 

 A.syluni, by the Institution Press, 1838. From John Alston, Esq. of 

 Roscmount, Hon. M. S. A. (609.) Thanks voted. 



Archibald Gibson, Esq., Accountant, 63 Queen Street, was admitted 

 as an Ordinary Member. 



\2>th Feh—kwHnsQw Fyfe, M. D., F. R. S. E., Vice-President, 

 in the chair. The following communications were laid before 

 the Society : — 



. 1. Description of a new machine for lifting Stereotype Moulds from 

 the Types, and a new metiiod of Baking the Moulds, &c. used in the 

 Stereotype; Foundry of Messrs IkiUantyne and Co. Edinburgh. By Mr 

 VOL. XXVIl. NO. LIV. — OCTOBEH 1839. F. e 



