440 



NEGRETTI AND ZAMBRA, HOLBORN VIADUCT, E.C., 



FIG. 2608. 



Flo. 2609. 



FIG. 2610. 



ELEOTRIC-META LLURGIC AL APPARATUS. 



ELECTROTYPE APPARATUS IS NOW EXTENSIVELY USED FOR OBTAINING BY 



GALVANISM EXACT FAC-SIMILES OF ENGRAVED COPPER PLATES, WOOD 

 ENGRAVINGS, MEDALS, PLASTER CASTS, ELECTRO GILDING AND PLATING, ETC. 



2607 



Eacb. 

 s. 



Each. 

 s. d. 



016 026 



2608 



Electrotype Apparatus, consisting of earthenware jar, 



with porous pot, zinc and wire (fig. 2607) . 

 Bound Glazed Stoneware Troughs, not permeable to 



sulphate of copper, with porous cell, zinc plate, 



binding screw and wire, suitable for copying medals, 



seals, plaster casts, &c. (fig. 2608) . . 5s. 6d. 7 6 10 6 



This apparatus is most convenient and simple in its operation, and particularly adapted for 

 those commencing to practise this interesting and useful art. 



2609 Electrotype Apparatus (fig. 2609) very convenient for 



copying small seals, medals, &c. . . . . . 15 



Electrotype Trough, square, with flat porous cell, 

 zinc plate and binding screw, and brass bars, on 



which to suspend the object to be copied (fig. 2610) . 16 



Electrotype Trough, as No. 2610, smaller size . 12 6 



2610 



2611 



FIG. 2613. 



FIG. 2615. 



