William Sturgeon. 269 



greater number of isolated discoveries of equal value and 

 importance, or left behind him a greater number of instru- 

 ments for others to work with. Some conception of his 

 great labours and numerous contributions to science may 

 be formed from the subjoined list of his papers : 



' i. An improved method of exhibiting M. Ampere's 

 rotating electro-magnetic cylinders, by employing a horse- 

 shoe magnet instead of a bar magnet, as previously used. 

 Phil. Mag. Sept. 1823. 



' 2. On new electro-magnetic experiments. Phil. Mag. 

 Feb. 1824. 



' 3. Electro and thermo-magnetic experiments. Phil. 

 Mag. April 1824. 



'4. Description of a rotatory thermo-magnetic appa- 

 ratus. Phil. Mag. April 1824. 



'5. On electro-magnetism. Phil. Mag. Oct. 1824. 



'6. On a new mode of showing the action which a 

 magnet exercises on metallic discs ; and on a novel phe- 

 nomenon discovered thereby. Edinburgh Phil. Journal 

 and London Phil. Mag. August 1825. 



' 7. Description of a complete set of improved electro- 

 magnetic apparatus. Trans. Soc. Arts for 1825. 



' 8. On the ignition of gunpowder by the electric dis- 

 charge, and on the transmission of electricity through 

 water. Phil. Mag. June 1826. 



1 9. On the inflammation of gunpowder and other sub- 

 stances by electricity, with a proposal to employ the term 

 momentum as expressive of a certain condition of the elec- 

 tric fluid. 



' 10. Recent experimental researches in electro-mag- 

 netism and galvanism. Published by Mr. Sturgeon, in 

 1830. 



