I. BATTERIES. 307 



Battery of 2O Secondary Elements, by Plante. 



M. Breguet, Paris. 



c. THERMO-ELECTRIC BATTERIES. 



Thermo-electrical Pile of Nobili, composed of 12 elements 

 disposed in rays. 



The Royal Institute of " Studii Superiori " at Florence. 



Thermo-electrical Pile of Nobili, divided into three 

 small ones of 12 elements each, to be combined at will. 



The Royal Institute of " Studii Superiori " at Florence. 



53. Thermo-electrical Pile of Nobili for the experiments 

 on radiant heat, composed of 37 elements, and furnished with a 

 conical mirror. 



The Royal Institute of " Studii Superiori " at Florence. 



It is well known that Leopoldo Nobili, who Avas for several years professor 

 at the lloyal Museum of Physical Science and Natural History of Florence, 

 was famous for the construction of thermo-electrical piles, of which he made 

 much use in his important experiments on radiant heat, partly carried out in 

 conjunction with the celebrated Melloni. 



1298a. Nobili's First Thermo-Electric Battery. 



Prof. Dove, Berlin. 



1298b. Melloni's First Thermo-Electric Pile. 



Prof. Dove, Berlin. 



1298c. Antinori's First Apparatus for Induction 

 Sparks. Prof. Dove, Berlin. 



This apparatus was bought at an auction in Florence, after Nobiii's 

 decease. 



1286b. Thermo-Electric Apparatus by Seebeck. 



1. Ring of copper and antimony. 



2. Cylinder of copper and antimony, 46 mm. in diameter and 



22 cm. in length. 



3. Six circular discs ; diameter 10 cm. ; of copper, brass, and 



other alloys. 



4. Square disc, 16 cm. 

 o. Two rods, Bi. Sb. 



Prof. Dr. Dove, Berlin. 



(Property of the lloyal Academy of Sciences at Berlin.) 



1265. Pouillet's Thermo-Electric Battery. 



Conservatoire des Arts et Metiers, Paris. 



1285. Thermo-electrical Battery, bismuth and antimony. 

 Geneva Association for the Construction of Scientific In- 

 struments. 



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