364 ' Proceedings of Societies. 



with the notice descriptive of its uses ; and a plan of a work-shop fitted up 

 in the most approved manner with these machines. By Mr James Dowie. 



Mr Alexander Nasmyth exhibited and described a model of an im- 

 proved gate for agricultural and ornamental purposes. 



Mr James Nasmyth exhibited and described a model of a method of 

 protecting chimney cans from the effect of wind. 



Messrs G. and J. Nasmyth exhibited some experiments relative to the 

 cause of the coldness of high pressure steam when issuing from a small 

 aperture. 



Mr RoBisoN exhibited some beautiful and delicate specimens of drill 

 turning. 



Mr John Milne, architect, teacher of mechanical and architectural 

 drawing, Edinburgh, was elected an Associate Member. 



April 22. — The following communications were made and models ex- 

 hibited, viz. 



Drawings on a large scale of the great steam engine erected at Stoney- 

 hill in 1827, by Messrs Claud Girdwood, & Co. for draining the coal 

 mines of Sir John Hope of Craighall Bart, both in section and in perspec- 

 tive, and intended to be engraved by subscription, were exhibited to the 

 Society. By Mr John Milne. 



A section drawing, and model of a double piston valve, proposed to be 

 substituted for the shde valve, particularly in working models of the steam 

 engine, whereby their cost will be greatly reduced and the waste of steam 

 prevented, were exhibited by Mr James Kilpatrick, Edinburgh. 



An Attwood's machine, without friction rollers, constructed byMr Dunn, 



optician, by which the application of friction rollers to that machine was 



said to be unnecessary for even very delicate experiments, and the cost of 



the instrument greatly reduced, was exhibited by Mr Dunn. 



The following Gentlemen were elected Members : 



Ordinary. 



Charles M'Laren, Esq. 



James Greig Junior, Esq. W. S. 



John Craig, Esq. 



John G, Kinnear, Esq. 



May 7.— A new instrument for procuring an instantaneous light, invent- 

 ed by Mr John Napier, joiner. South Richmond Street, Edinburgh, was 

 exhibited and described. 



Mr John Milne exhibited his drawings of the steam engine at Stoney- 

 hill, and read a description of them, which is intended to be pubUshed 

 along with the drawings. 



Adam G. Ellis, Esq. W. S. was admitted an Ordinary Member. 



Dec. 3. — The following communications were made : 



A description of an Apparatus for sweeping Chimneys, invented by the 

 Rev. George Tough, Ayton Manse, was read, whereby the use of climb- 

 ing boys is rendered unnecessary. 



A description of a clock pendulum, in which the impulse is received di- 

 rectly from the swing wheel, without the intervention of either fork or 

 verge, invented by Mr Alexander Doig, watchmaker Musselburgh^ 

 was read, and a working model exhibited. 



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