306 SEC. 10. ELECTRICITY. 



1277a. Yeates* Improved Leclanche Cell. 



Prof. W. F. Barrett. 



New form of Leclanche cell, the position of the zinc and carbon are reversed, 

 thus rendering it less liable to polarisation, and hence far more constant than 

 the ordinary form. Made by H. Yeates, King Street, Covent Garden. 



1278. Drawing and Description of a Galvanic Battery, 



with arrangement for combining the elements ad libitum. 



Dr. Tasche, Giessen. 



1279. Portable Battery for Electro-therapeutic Pur- 

 poses. 24 elements. Prof. Beetz, Munich. 



1279a. Round Immersion Battery, with automatic break 

 for medical purposes. J. Teller, Munchen. 



By this arrangement powerful action is obtained, and a very constant current, 

 even with great resistance. The consumption of zinc is (in consequence 

 of self-amalgamation in the acid chromate of mercury solution) very small, 

 and this result is also favoured by the small immersion, which is limited 

 by the slide on the upright bars. By the automatic interrupter, the battery 

 can be used also with intermittent current, and such a battery current (because 

 without alteration of poles) is to be preferred to the action of an induction 

 current. 



1280. Portable Battery, with Ebonite Insulations for 



the investigation of tension phenomena. 16 cells. 



Prof. Beetz, Munich. 



1281. Delicate Battery, with four platinum-zinc elements, 

 two silk conducting strings, with eight reserve plates in a case. 



Kgl. Chirurgische JKlinik, Breslau, Prof. Dr. Fischer. 



1282. Delicate Battery, with four carbon-zinc elements. 

 Kgl. Chirurgische Klinik, .Breslau, Prof. Dr. Fischer. 



1283. Delicate Battery, with two carbon-zinc elements, two 

 conducting strings, and three reserve plates in case. 



Kgl. Chirurgische Klinik, Breslau, Prof. Dr. Fischer. 



1284. Small Battery, with two platinum-zinc elements. 

 Kgl. Chirurgische Klinik, Brest au, Prof. Dr. Fischer. 



In galvanocaustics (the art of destroying diseased portions of tissue by 

 means of the electric current) the batteries used generally consist of four 

 very large Grove or Bunseu elements. Wires proceed from the battery to a 

 piece of platinum, which is to be raised to a red heat. This collection shows 

 Middeldorff's original arrangement, as used in Breslau, and also recent 

 modifications. 



Two Secondary Elements, by Plante. 



M. Breguet* Paris. 



Battery of 2O Secondary Elements, by Plante. 



M. Breguet, Paris. 



