I. BATTERIES. 265 



1280. The Same, with Ebonite Insulations for the inves- 

 tigation of tension phenomena. 16 cells. Prof. Bectz, Munich. 



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

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



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



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

 Kgl. Chirurgischc 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, Breslau, Prof. Dr. Fischer. 



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

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

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

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

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

 modifications. 



c. THERMO-ELECTRIC BATTERIES. 



1285. Thermo-electrical Battery, bismuth and antimony. 

 Geneva Association for Constructing Scientific Instru- 

 ments. 



1285a. Apparatus for Volta's Fundamental Experi- 

 ment, with arrangement for chloride of calcium, with two brass, 

 one copper, and one zinc plate, with insulating handle. 



JVarmbrunn, Quilitz } fy Co., Berlin. 



1286. Nobili's Thermo-Electric File, of 54 pairs of bis* 

 muth and antimony bars, soldered alternately together ; the smallest 

 temperature between the two faces of the pile developes a current, 

 readily indicated by a suitable galvanometer. El Hot t Brothers. 



1287. Noe's Thermo-electric Battery of 96 pairs. Con- 

 venient for lecture experiments. George Gore, F.R.S. 



Attains its maximum power in about one minute. May be heated to low 

 redness. Decomposes water freely. Will excite an electro-magnet to sus- 

 tain 2 cwt. It has an arrangement, or " current transformer," by means of 

 which its entire power can be employed with three different combinations of 

 its elements, viz., as 96 by 1, 48 by 2, or 24 by 4, and changed instantly from 

 one combination to another. The connexions of the " transformer " require 

 no cleaning. Made by W. J. Hauck, Vienna. 



1288. Small Single-cell Apparatus, with platinum-plates, 

 for showing the thermo-electric properties of liquids. 



George Gore, F.R.S. 

 (See Philosophical Magazine, Jan. 1857.) 



