180 L. CASELLA'S CATALOGUE 



2100. ELECTROTYPE TEOUGH, with sliding bars, on which to place the object to be 

 copied, 1 porous cell, 1 copper plate, 2 wires for moulds, 4 movable binding 

 screws, complete in mahogany box, 7 inch, by 8 inch., and 7^ inch, deep 



14 G 



2102. SMEE'S BATTEEY APPABATUS, with separate precipitating trough for several 



small medals at once, and plaster casts . . . 100 



2103. SMEE'S BATTEEY APPAEATUS, for larger medals or casts (Jig. 2103), p. 179 1 12 6 



Electro -plating and gilding are also now extensively carried on by this process, and from its 

 perfection as well as simplicity, must almost in time become familiar in every household ; fig. 

 2106, p. 179, represents the apparatus in action, and the small hand book " Electro Metallurgy," 

 price 2s., gives every further requisite information. 



2104. Apparatus for Electro-Gilding or Plating, with glass precipitating trough and 



1 Smee's battery . . . . . . 17 6 



2105. APPAEATUS, with 2 Smee's batteries . . . . 160 



2106. 3 (fig. 2106), p. 179 . 1 15 6 



2107. APPAEATUS, for coating metallic bodies with aluminium and silicium, 7s. 6d. to 



10 6 



2108. Platinized Silver, averaging about 4 oz. to the square foot, .as required, per oz. 



11 



2109. GOLD WIEE AND PLATE, per dwt., 8s. ; silver ditto, per oz. 080 



2110. COPPEE WIEE AND PLATE, of any thickness ; amalgamated zinc plates of all 



sizes, per Ib. . . . . . . . 016 



2112. SULPHATE or COPPEE, per Ib. .... . 006 



2113. GOLD AND SILVEE SOLUTION, per Ib., Is. 9d. and - :. ..; ... . 030 



2114. BINDING/ SCEEWS, of various forms and descriptions, each 6d., 8d., 10d., and 



014 



*#* Porous cells, superior plaster of Paris medallions, and all other apparatus for the 

 above useful arts of any size or description, supplied to order. 



2115. Volta-meter or Apparatus for Decomposing Water, with separate tubes for 



collecting the oxygen and hydrogen gases, small size 8s. 6d. to 15 6 



2116. VOLTA-METEE OB APPAEATUS FOE DECOMPOSING WATEE, large size, very 



suitable for the lecture table, from. . . . .. 100 



2L17. V TUBE, for decomposing neutral salts, etc., with platinum plates and brass 

 support, on mahogany frame . . . . ' . 070 



2118. GLASS GLOBE, for exhibiting brilliant voltaic light in vacuo . 1 12 



2119. Gassiot's Vacuum Tubes, the various forms for showing the electrical stratifi- 



cations in discharges, as first manufactured by L. CASELLA, for the extended 

 and interesting experiments of Mr. Gassiot, and exhibited by him in illustra- 

 tion of his Bakerian lecture at the Royal Society, and also at the meetings of 

 the British Association, 1858 and 1859 (see Eoyal Society's Eeports, etc). In 

 every variety, 7s. Gd. to . . . . 1 10 



