xii LIST OF ILLUSTRATIONS. 



PAGE 



25. Special Polishing Machine v. 137 



26. Oven for Drying the Nickeled Pieces 139 



27. Simple Bath - 169 



28. Hydraulic Press for Moulding Woodcuts 173 



29. Plumbago Coating Machine 174 



30. Plate-drawing Machine 179 



31. Finishing Machine I 80 



32. Gramme Machine for the Refining of Copper 200 



33. Wilde Machine 208 



34. Siemens Machine 21 



