424 'Proceedings of the Society of Arts. 



3. Description of a New Method of Propelling Steam-Vessels. By 

 Mr D. T. Hopcj 34 Biiccleuch Place, Edinburgh. — A Model was exhi- 

 bited. (642.) Referred to a Committee. 



4. Description and Drawings, — 1st, Of an Improvement on the Com- 

 mon Smith's Vice : — and, 2dly, Of an adjusting Drill Chuck, suitable for 

 Turning Lathes, or Vertical Boring Machines. By Mr James Marshall, 

 Engineer, 4 Coupar Street, North Leith. Models were exhibited. (637.) 

 Referred to a Committee. 



\hth 3/«y.— Andrew Fyfe, M. D., F.R. S. E., Vice-President, 

 in the Chair. The following communications were laid before 

 the Society : — 



1. Through the kindness of Mr Cooper, a Model of Mr Russell's Pa- 

 rallel Motion for the Steani-Enginc was exhibited. Thanks voted. 



2. Part III. of an Essay on the present state of Art, as applied to Bri- 

 tish Manufactures. By Mr John Whyte, Pattern Drawer, 39 Clerk 

 Street, Edinburgh. (601.) Thanks voted. 



3. Description and Model of Mr Hutcliison's mode of heating Fer- 

 menting Liquids in very cold Weather. Communicated by Dr D. B. Reid, 

 F. R. S. E., M.S. A. (G44.) Thanks voted for the Models. 



4. Notice of the Chemical Abacus, used for facilitating the study of 

 Theoretical and Practical Chemistry. By Dr D. B. Reid. (646.) Thanks 

 voted. 



6. Notice of Long's American Frame Bridge. By David Stevenson, 

 Civil Engineer, M.S. A. (648.) 



Working drawings, and a model constructed by Messrs Maxton 

 of Leith, of a bridge on this principle, 150 feet span, to be 

 erected in India, were exhibited. It was remarked by an emi- 

 nent architect who was present, that the principle on which 

 the framing of this bridge is constructed, might be applied 

 with great advantage to many other purposes, where great 

 lightness, combined with strength and rigidity, are requisite. 

 Thanks voted to Mr Stevenson for his communication, and also to 

 Messrs Maxton for their construction of the model. To be 

 printed in tho Transactions, with a Plate, if Mr Stevenson agrees 

 to it. 



6. Donations. — Mr Alston of Rosemount, Hon. M.S. A., attended, and 

 presented his latest Specimens of Printing for the Blind, being a copy of 

 the Book of Genesis, intended as a commencement to the printing of the 

 whole Bible for the use of the Blind. (650.) Mr Alston also presented 

 two other books for the blind. (652) and (653.) 



Thanks voted to Mr Alston for his donations, and for his continued 

 zeal and gratuitous exertions in the cause of the Blind. 



7. Donation. — On the Colour of Steam under certain circumstances ; and 

 on the Colours of the Atmosphere. By Professor Forbes, F. R. SS. L. & E. 



