Proceedings of the Hoyal Scottish Socieff/ of Arts, 413 



tempering of steel tools, as it can be seen wlien the steel acquires the pro- 

 per temperature, and thus rendering it unnecessary to bring back the tem- 

 per, which is very hurtful in many cases. Thanks votei to the exhibitors. 

 (866, 867, 868.) 



6. Major Playfair exhibited some beautiful specimens of Daguerreotype 

 Portraits, executed by M. Claudet, at the Adelaide Gallery, London, by the 

 Refracting Camera. Thanks voted. (869.) 



The following Donations were laid on the table : — 



1. The Civil Engineer and Architect's Journal, Nos. 46, 49, and 52. Pre* 

 scnted by Mr Knowles. (850.) 



2. Report of a Committee to the Lord Mayor, &c. of London, on the nui- 

 sance arising from the Smoke of Manufactories and Steam-Engines. Pre- 

 sented by Henry Woodthorpe, Esq. (852.) 



3. Trigonometrical Surveying, Levelling, and Railway Engineering. By 

 William Galbraith, M.A., F.R.S.S.A., F.R.A.S. 1842. Presented by the 

 Author. (8tJl.) 



Thanks voted to the donors. 



PRIVATE BUSINESS. 



The following Candidates were balloted for, and elected as 

 Fellows, viz. : — 



1. Mr Paul Crawford, agent for Falkirk Iron Company, 21 Geo. IV. 

 Bridge. 



2. Mr Robert Muller, artist and pianist, 27 George Street. 



3. Mr William Cushnie, Malta Green. 



4. Mr William Croall, coach-builder, 21 Broughton Street. 



II. On the motion of the Council, the following distinguish- 

 ed foreigners were elected as Honorary Members, viz.: — 



1. M. le Baron Thonard, Membre de la Societe d'Encouragement i»our 

 I'Industrie Nationale de Paris. 



2. M. le Baron Seguier, do. do. 



3. M. Pouillet, Membre de I'Academie des Sciences de Tlnstitut, Prof. 

 de Physique au Conservatoire des Arts et Metiers. 



28M February 1842.— Sir John Robison, K.H., Presi- 

 dent, in the Chair. The following Communications were 

 made : — 



1. Description,withDrawings, of a Brine-Gauge, or Salinometor, for indi- 

 cating the degree of saturation of the brine of Marine- Boiler?. Invented 

 by John Scott Russell, A.M., F.R.S.S.A., civil engineer, Grcenotk. Thanks 

 voted, and to be printed in the Transactions. (876.) 



2. On Improvements of the Solar and Ox) hydrogen Microscope, Polaris- 

 cope, &c. By Mr Thomas Davidson, optician, Edinbuigh, F.K.S.S.A. 

 Referred to a committee- (857.) 



3. Third Notice on the Mechanical Arts of Persia, including Carpentry, 



