Astronomy. 1T5 



A Model, showing the Application of the Lever to work Chain Pumps 

 &c. by Mr W. Ballantynj, was exhibited. 



Mr Thom's Rain-Guage was also exhibited, and an Improved Syphon, 

 by Mr Hunter of Thurston. 



April lith. — The various models and machines described to the Society, 

 during the Session, were exhibited at this meeting- The Society adjourn- 

 ed till the 6th of December. 



December 6th. — The Society of Arts resumed its sittings for the winter. 



An Account of a Rotatory Gas Burner, invented by Mr Nimmo, brass- 

 founder in Edinburgh, was read. See this number, p. 152. 



Professor Wallace gave a Description of a new Revolving Bookcase. 



There was read, an Account of Mr Whitelaw's New Compensation 

 Pendulum. 



The following Machines were Exhibited. 



t. The Rotatory Gas Burner was exhibited to the Society in operation. 



2. Professor Wallace's Revolving Bookcase was exhibited. 



3. Mr Whitelaw's New Compensation Pendulum and Clock was exhibited 

 in complete operation. A description it will be given in our next number. 



December 7th. — At a general meeting held this day, the Right Honoura- 

 ble the Lord Provost in the chair, the Society awarded a Gold Medal to 

 Mr David Whitelaw, watchmaker, 16, Prince's Street, Edinburgh, for 

 his Clock with Improved Compensation Pendulum. 



The Society also awarded a Gold Medal to Professor Wallace for his 

 Eidograph, an Instrument for Reducing and Enlarging Drawings. 



The Society likewise awarded a Silver Medal to Mr Shiells, for his 

 Triangle for Directing the Jet of Fire Engines, described in this Journal, 

 No- v. p. 150. 



Art. XXXII.— SCIENTIFIC INTELLIGENCE. 



I. NATURAL PHILOSOPHY. 



ASTRONOMY. 



1. First Comet of 1825. — The following elements of this comet have been 

 calculated by M- Shumacher, from the observations made by M. Gam- 

 bard :— »• 



Passage of perihelion, - 1825, May 31. 473 



Long, of perihelion - - • 273* 29' 30" 



Long, of node - - - - 17 48 10 



Inclination of orbit - - 87 26 40 



Perihelion distance - - - 89 96 

 Motion retrograde. 



M. Pons saw this comet so late as the 14th July 1825. 



2. Second Comet of 1825. — This comet was discovered by M. Pons on the 

 15th July in Taurus, and has been observed by various astronomers. M. 

 Cupocci observed it about the 25th of August- He describes it as sur- 



