THE 



PHILOSOPHICAL MAGAZINE 



AND 



ANNALS OF PHILOSOPHY. 



[NEW SERIES.] 



JULY 1831. 



I. On the Thermo-Magnetism of Homogeneous Bodies ; with 

 illustrative Expei-iments. By Mr. Wm. Sturgeon, Lecturei' 

 on Experimental Philosophi/ at the Hon. East India Compani/s 

 Military Academy, Adiscombe*. 



[With a Plate.] 

 1. Tj^IGHT or nine years have now elapsed since Dr. See- 

 -*-^ beck, a Prussian philosopher, unfolded a most import- 

 ant secret of nature, by the discovery of magnetic powers in 

 various metallic combinations, by merely submitting their 

 points of union to different degrees of temperature ; — a dis- 

 covery of equal, if not superior interest, to that of electro- 

 magnetism by CErsted the illustrious Dane. Each of those 

 discoveries marks a distinct and important epoch in the hi- 

 story of experimental science, and each philosopher now en- 

 joys that degree of fame to which he is so justly entitled. 



2. Philosophers in every civilized country have repeated 

 the experiments of those celebrated men, — admired the beauty 

 and interest of the phaenomena they present, and vied with 

 each other in adding new facts to those already known. Heat, 

 magnetism, and electricity are now blended in our experi- 

 ments, and new sciences have been reared upon the phaeno- 

 mena they have jointly presented to our notice. 



3. The discovery of CErsted, and the train of curious and 

 interesting pluenomena to which it has directed our view, rest, 

 principally, upon the action of metallic combinations, and a 

 mode of excitation, which to philosophers have long been 



■ known ; — whilst the discovery of Seebeck, on the contrary, not 

 only depends upon new arrangements, but also upon the novel 



• Communicated bv the Avthor. 

 N.S. Vol. 10. No. 55. Jidy 1831. B mode 



