563 



SECTION 13. CHEMISTRY. 



WEST GALLERY, UPPER FLOOR, ROOM 



I. HISTORICAL. 



2401. Balance used in his experiments by Dr. Joseph Black, 

 Professor of Chemistry in the University of Edinburgh, from 

 1766 to 1799. Dr. Black was the discoverer of fixed air (carbonic 

 acid), and author of the theory of latent heat. 



Edinburgh Museum of Science and Art. 



2398. Balance used by Cavendish. 



The Royal Institution of Great Britain. 



This balance, of rude exterior but singular perfection, was made by Harri- 

 son according to the plan and by order of Henry Cavendish, Esq., and passed 

 at his death to his cousin and heir, Lord George Cavendish. By him it was 

 presented to Sir Humphry Davy, together with the greater part of Mr. 

 Cavendish's philosophical apparatus. Presented to the Royal Institution of 

 Great Britain by Mr. Felix R. Garden. 



24Ola. Balance used by, or formerly belonging to, Dr. 

 Priestley. William Sykes Ward. 



This is remarkable as a good specimen of early work, having friction pulleys 

 for suspending the beam ; also an interchangeable piece with steel planes, 

 gearing for raising the beam concealed in foot, extra pans and glass bucket 

 for taking specific gravities. The successive owners of the balance are believed 

 to have been : Dr. Priestley (Leeds), Abraham Sharpe (Bradford), Joshua 

 Muff (Leeds), and the Exhibitor. 



2400. Balance used by Sir Humphry Davy. Presented to 

 Professor Roscoe by Mrs. F. Crace-Calvert. 



Prof. Roscoe, F.R.S. 



2399. Balance used by Dr. Thomas Young and Sir 

 Humphry Davy. The Royal Institution of Great Britain. 



A balance made by Fidler for the Koyal Institution, nearly resembling 

 those of Ramsden and Troughton. " Lectures on Natural Philosophy," by 

 Thomas Young, M.D., 1807. " Works of Sir Humphry Davy," vol. 5, 

 page 17. 



2537. Pneumatic Trough used in his experiments by Dr. 

 Joseph Black, Professor of Chemistry in the University of Edin- 

 burgh, from 1766 to 1799. Dr. Black was the discoverer of fixed 

 air (carbonic acid), and the author of the theory of latent heat. 



Edinburgh Museum of Science and Art. 



Nn 2 



