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=Prussic Acid= is the most active of poisons. The diluted hydrocyanic acid of the Pharmacopoeia contains 2 per cent. of hydrocyanic acid, Scheele's 4 per cent. It is a colourless liquid, feebly acid, with odour of bitter almonds. =Cyanide of Potassium= is largely used in photography and in electro-plating, and is also poisonous.
The ornamental pottery which is still made though in a small quantity resembles Doulton ware, but the great development of the industry has been in the direction of glazed ware of great resisting power. Cheavin's patent filters are sent all over the world, and a speciality is made of the chemical trade, immense baths for the electro-plating acids being supplied to Government.
Thus to name a few: If mechanical motion develops electricity, electricity will produce mechanical motion; the movement of a pith ball and an electric motor are examples. If chemical action can produce it, it will produce chemical action, as in the decomposition of water and electro-plating. As heat may be its antecedent, so will it produce heat.
"Well, perhaps it mightn't be wise to rush into extremes all at once! I wouldn't insist on the truth, if I were you. What's the House of Commons that it should be cockered up with the truth? All that is needed is enough to go on with. An electro-plating of veracity is in keeping with the economic tendencies of the age."
Usually, however, it is the weight of silver or copper deposited from their salts in a certain time which gives the current in amperes. Electro-plating is the principal application of this chemical process. In 1805 Brugnatelli took a silver medal and coated it with gold by making it the cathode in a solution of a salt of gold, and using a plate of gold for the anode.
Let us walk into his studio, and examine some of his painting machinery. THE DAGUERREOTYPE. A silver-plated sheet of copper is resilvered by electro-plating, and perfectly polished. It is then exposed in a glass box to the vapor of iodine until its surface turns to a golden yellow. Then it is exposed in another box to the fumes of the bromide of lime until it becomes of a blood-red tint.
One brush is the positive pole of the dynamo, the other is the negative, and the current will flow through any wire or external circuit which may be connected with these, whether electric lamps, motors, accumulators, electro-plating baths, or other device.
Wright, of the same town, discovered the practicability of electro-plating about the same time that several other persons had discovered that metal could be deposited by a galvanic current, but had not thought of applying it practically to manufactures.
Electro-plating has not, as was imagined on its first discovery, lessened the demand for manual labour in the plate trade; on the contrary, it has largely increased it, while extending the sale of a superior, and superseding an inferior, class of goods.
A century ago this famous town was known as the "toy-shop of Europe." Its glass-workers stand at the head of their profession, and here are made the great lighthouse lenses and the finest stained glass to be found in English windows. The Messrs. Elkington, whose reputation is worldwide, here invented the process of electro-plating.
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