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Let the slate receive a heavy or thick coating by the electrotype, then polish, coat, expose in the usual manner, and the result will be a flat, ashy, indistinct impression; when, on the other hand, the thin coating will produce a bright, clear and distinct image, with all the details delineated.
Since that date electrotype plates have displaced stereotypes, as they afford a sharper, clearer impression and endure more wear. In a First Reader printed in the fall of 1841 there are two pages of advertising matter in which Truman & Smith claimed to have sold 700,000 of the Eclectic Series.
Gilding the Daguerreotype has much to do towards producing a good electrotype copy. This should be done by applying a little heat, and gilding very slowly, giving a coating of gold with the greatest possible uniformity. By this method, I have been enabled to produce any number of proofs. I have produced a dozen from one impression, and it remains as perfect as when first taken.
It has never left the custody of the Warden, save when it was sent, concealed on the person of Professor and Commander Burroughs, to the Naval Exhibition some years ago; and last year, when after an interesting correspondence between the College and Colonel Maxse commanding the Coldstream Guards, leave was cordially given to that distinguished regiment to have an electrotype made of the Blake medal for its own exclusive use, and to be kept in perpetuum among the memorials of its long history.
In this way a facsimile of the gelatine picture is produced at the distant station, and an electrotype or cliche of it can be made for printing purposes. The method is, in fact, a species of electric line graving, and Mr. Amstutz hopes to apply it to engraving on gold, silver, or any soft metal, not necessarily at a distance.
The country curate, visiting Paris, arranged for the immediate delivery of a remonstrance, in electrotype, Byzantine style, signing a series of long- dated bills, contracting, by zeal supplemented by some ready cash, to fulfil his liabilities, through the generosity of the faithful ones.
'When, said he, 'the electrotype process first became known, it excited a very general interest; and although I was only a young student at Gottingen, under twenty years of age, who had just entered upon his practical career with a mechanical engineer, I joined my brother, Werner Siemens, then a young lieutenant of artillery in the Prussian service, in his endeavours to accomplish electro-gilding; the first impulse in this direction having been given by Professor C. Himly, then of Gottingen.
It is from us that they have learned the art of casting type, especially that splendid achievement, the making of stereotype plates, and, later, electrotype plates, by the aid of electricity and acid solutions. Chemistry, from which this beautiful art takes its rise, carries us back to China, for it was there that alchemy had its birth, as I have elsewhere shown.
Not being able to cast out the intruder, the feeble but diligent inhabitant covers it with a sort of saliva, which hardens over it into a substance similar in consistency and sheen to the interior surface of its own shell. The act of covering a base substance of any shape with gold or silver by the process of electrotype is in human art an analogous operation.
The actual printing surface, of course, consists of an electrotype or stereotype taken from this metallic-grained photographic face. For "high-art" printing on fine paper with the more expensive kinds of ink, the half-tone zinco processes will doubtless maintain their supremacy and gradually diminish the area within which lithographic printing is required.
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