Troteedings of the Society of Arts. 411 



cess, and stated, that, with the improved apparatus, much more perfect pic- 

 tures arc produced, and the colours more nearly approachin;^ to those in 

 nature. He stated, that, in France and Italy, from the greater brilliancy 

 of the light, much bettor pictures could be produced with his improved ap- 

 paratus, than those procured by Daguerre's process. Thank* voted, and to 

 be printed in the Transaction?. 



4. Description of a Method of Photographic Printing, by Mr W. Fraser> 

 Aberdeen. Communicated by the Secretary. Specimens were exhibited. 

 (741.) Thanks voted. 



5. Donation — Printed Reports (in duplicate) relative to Smith's Patent 

 Screw Propeller, as used on board the "Archimedes" Steam-vessel, &c. 

 By Captain Edward Chappell, R.N. London, 1840. Presented by Captain 

 Chappell. (740.) Thanks voted. 



6. Donation — Specimens, with Description of the Seam of Black-band 

 Ironstone now being wrought on his property of Nether Carbellow, in tlie 

 parish of Auchinleck. Presented by John Robertson, Esq. of Duncanze- 

 mere, W. S. (743.) Thanks voted. 



Richard Hunter jun., Esq., W. S., 1 Doune Terrace, was admitted an 

 ordinary member. 



A Communication from the Experimental Committee was read, making 

 a donation of their funds to the Society for experimental purposes. Thanks 

 voted. 



14M i)^cm5^r 1840.— Andrew Fyfe, M.D., F.R.S.E., Presi- 

 dent, in the chair. Before proceeding to the business of the 

 evening, the President stated that the address of congratulation 

 to her Majesty on the birth of the Princess Royal, agreed to 

 at last meeting, had been presented to the Queen by Lord 

 Normanby, and that he had received a letter from his Lord- 

 ship, stating that her Majesty had been pleased to receive the 

 same very graciously. The following communications were 

 made : — 



i. On Trigonometrical Surveying and Levelling, and on tlie effects of a 

 supposed local attraction at the Calton Hill, Edinburgh, By William Gal- 

 braith, A.M., M. S. A., Teacher of Mathematics, Edinburgh. (742.) 

 Thanks voted, and ordered to be printed in the Transactions. 



2. An account of the Plan of Telegraphing by Electro-Magnetism. By 

 William Alexander, Esq., F.R.S.E., M.S.A. A Model was exhibited in 

 operation, which excited much interest. (760.) Thanks voted. Remarks 

 were made by Messrs Ponton, Sang, Dunn, Bryson, and others. Some in- 

 teresting conversation also took place relative to the effect of a metallic 

 wire connecting two clocks, in producing isochronous vibrations in their 

 pendulums. 



3. On the method of manufacturing Bricks in Persia, By James JRobert- 



