202 Proceedings of the Society of Arts. 



Treasurer.— B.6bert Horsburgh, Esq. 15. London Street. 



Curator. — Mr John Dun, 50. Hanover Street. 



Ordinary Councillors — James Jardine ; George Buchanan ; John Robi* 

 son ; Sir D. Mihie ; Dr D. B. Reid ; Mungo Ponton ; I.ieut. CoL 

 Macdonald ; J. S. More ; William Fraser ; Wilkinson Steel ; George 

 S win ton ; J. Graham Dalyell. 



The following gentlemen were admitted as ordinary members :— - 



L William Burn, Esq. Architect, 131. George Street, Edinburgh; 2. 

 Mr Patrick Ritchie, Machine-maker, 56. Nicolson Street ; 3. Mr J. 

 B. Mould, Engraver, 129. High Street. 



Dec, 2. — The following communications were read : — 



1. Part second of a paper on the construction of Oblique Arches. 

 By Edward Sang, Esq. teacher of Mathematics, &c. Edinburgh, 

 and Councillor Soc. Arts. 



la this part of the paper Mr Sang made some comments on the 

 usual manner of constructing the abutments of bridges, and shewed 

 that the effect of the ordinary form is to throw the whole pressure 

 upon the exterior parts of the foundation. In order to equalize the 

 pressure, he said that parabolic counter-arches ought to be intro- 

 duced. In the next part of the paper, he proposed to treat of the 

 forms of the stones, and to examine some circumstances connected 

 with the propagation of pressures which have not hitherto been at- 

 tended to. 



2. Additional verbal Remarks on the Communication of Sound 

 in Public Buildings ; and on the Construction of Pulpits. By Dr 

 D. B. Reid, lecturer on chemistry, Edinburgh, Couns. Soc. Arts. 



3. Drawings of the American Patent Steam-boat, adapted to 

 the Navigation of the Clyde. By Mr Neil Snodgrass, who fitted 

 the machinery of the celebrated American Steam Raft Boat, — were 

 exhibited. 



List of Patents granted in Scotland from l^th September to 

 9th December 1835. 



1835. 

 Sept. 19. To William Symington, of Bromley, in the county of Middlesex, 

 coopei', for " certain improvements in paddle-wheels.'* 

 To Andrew Baldrence, chenille-cutter, residing in Paisley, for " a 

 machine for cutting chenille cloth into chenille thread for making 

 weft or part of weft for the shawls now called and known by the 

 names of Chenille, Kamptschatcka, Moss, and Velours de Sole, 

 or one or other of these names." 



