178 L. CASELLA'S CATALOGUE 



2075. GBOVE'S BATTERY, mounted in plainer form, with 10 cells in black wood frame, 



the platinum plates 2 by 3| inch. . . . . 450 



2076. GEOVE'S BATTEEY, with set of 8 cells . . . . 3 12 



2077. 4 . . . . 200 



2078. for producing electric light, 40 cells, in 4 batteries of 10 

 cells each 17 



2079. GEOVE'S BATTEEY, of greater power, with larger platinum plates, viz., 3 by 5 



inch., 10 cells in black wood frame . . . . 6 10 



2080. A combination of 4 of these forms, a powerful battery for giving electric light, 



being so constructed that nearly the whole surface of the platinum is exposed 

 to the action of the acid . . . . . 25 



2082. Bottle Batteries (fig> 2082), p. 183. The neatness of these batteries, together with 



the effectual way in which evaporation is prevented, renders them most 



popular where appearance and cleanliness is desired ; f pint size, 10s. 6d. ; 1 



pint size, 12s. 6d. ; 1 quart size, 1 ; 2 quart size, 1 15s. ; 4 quart 2 15 



The 2 quart and 4 quart size have 5 carbon plates and 2 zinc, the former exposing 48 square 



inches surface and the latter 112 square inches. 



Bunsen's Carbon Batteries^ with zinc cylinders, square carbon blocks, porous cells, 

 glass cells, and connecting screws, complete : 



2083. FIBST SIZE, carbon lj by 4|- inches . : ... 066 



2084. SECOND SIZE, H 6 . . . . 090 



2085. THIBD SIZE, If 8 . . . . 10 6 

 The solutions for these batteries are concentrated nitric acid for the porous or carbon cell, 



and diluted sulphuric acid for the glass cell, the proportions being 1 of acid to 7 of water. 



2086. Carbon Cups, of best make, f to i inch diameter and 3 inch, long, for defla- 



grating metals, per dozen .... > .. 7 



2087. CABBON POINTS, for electric light, per foot, Is. 



2088. CAEBON PLATES AND BLOCKS : 



31. by 2 . 10 I 7J by 3 . ' . 023 



4 2 . 8 7* 4 . . 026 

 4* 3 . 1 2 5 | by i 009 

 6i Si , 2 6 li ' J 013 



5 2 1 8 H i ;. 020 



6 2 . 1 3 9* 1 ,,lf . 026 

 6 3| . 2 3 I 12 If If . 036 



Carbon cut for battery plates, blocks, trays, and cups, points for electric light, crucibles, 

 experimental work, etc., etc., and platinized to order. 



DR. CALLAN'S CAST-IRON BATTERIES, 



Consisting of flat cast-iron cells with porous linings and flat amalgamated zinc 

 plates, a binding screw connected with the iron cell, and a copper band soldered to 

 the zinc. 



The solution for the porous or zinc cell being 1 of strong ordinary sulphuric acid 

 to 7 of water, and for the iron cell concentrated nitric acid. 



2089. FIBST SIZE, with iron cell, 51 inches long by 5| inches deep, and If inches wide 



066 



