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Now, when you cause chemical disturbance in an electric battery, the energy thus evolved is called electricity, and we provide a conductor of escape for it in the shape of a copper or other metal wire, which we may carry to any distance we please, and the energy runs along it, as the wave runs along the carpet, as long as you keep up the commotion in the battery among the excited atoms of copper and zinc."
Thus, for example, in Derbyshire, veins containing ores of lead, zinc, and copper, but chiefly lead, traverse alternate beds of limestone and greenstone. The ore is plentiful where the walls of the rent consist of limestone, but is reduced to a mere string when they are formed of greenstone, or "toad-stone," as it is called provincially.
No harm to cut that off short and parcel and serve the end and cap it with a zinc cap;" or, "Better be cutting the Yartle Bush for the next fallow, it chokes the gammon-rings, and I don't like to see so much standard ivy about, it's the death of trees."
Its mines of gold, zinc, lead, coal, and iron offer an irresistible temptation to pushing capitalists and their governments, who feel further attracted by the credible announcement that it also possesses oil in quantities large enough to warrant exploitation.
This was a shell of zinc lined with white satin, in which was a mattress furnished with a pillow. There not being room for the hat to remain on his head, it was placed at his feet, with some eagles, pieces of French money coined during his reign, a plate engraved with his arms, etc.
Miss Brundon's office, rigorous as the corridor of a hospital, had a table and uncompromising wooden chairs on a rectangle of bluish-pink carpet; a glowing, round stove held a place on a square of gleaming, embossed zinc, while the remaining surfaces were scrubbed oak flooring and white calcimine.
The mould is then placed in the bath, containing a solution of sulphate of copper, and is made a part of an electric circuit, in which is also included the zinc element in the sulphuric-acid solution in the other bath.
His assistant, a lad of seventeen, was blowing up the furnace with a pair of bellows, and at each puff a great cloud of sparks arose. "Put in the irons, Zidore!" shouted Coupeau. The boy thrust the irons among the coals which showed only a dull pink in the sunlight and then went to work again with his bellows. Coupeau took up his last sheet of zinc.
But before embarking on this phase of my subject it may be interesting for a moment to go a little deeper into the earlier stages of this marvellous change from boxwood to zinc.
Water, for example, contains a store of oxygen, which may unite with, and consume, a metal immersed in it; it is from this kind of combustion that we are to derive the heat and light employed in our present course. The generation of this light and of this heat merits a moment's attention. Before you is an instrument a small voltaic battery in which zinc is immersed in a suitable liquid.
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