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The tailings are placed in vats, and subjected to the action of solutions of cyanide of potassium of varying strengths down to 0.2 per cent. These dissolve the gold, which is leached from the tailings, passed through boxes in which it is precipitated either by means of zinc shavings, electricity, or to the precipitant.
The misapprehension was at least no greater than that which prompted some full-grown man to ship a zinc house to the one spot in the world where the most readily splitting lumber was plentiful. One of the sights shown to the newcomer was a two-story house built before the era of the sawmill. It was built of split lumber from a single redwood tree and enough remained to fence the lot!
To apply it on new plates use nitric acid applied with a swab to free the surface of the copper from oxides or impurities, then rub the ball of amalgam over the surface using some little force. It is always well when coating copper plates with silver or zinc by means of mercury to let them stand dry for a day or two before using, as the mercury oxidises and the coating metal more closely adheres.
There was also a zinc locker, but he was unable to negotiate the padlock of this. "Shan't starve," said Bert, "for a bit, anyhow." He sat on the vendor's seat and regaled himself with biscuits and milk, and felt for a moment quite contented. "Quite restful," he muttered, munching and glancing about him restlessly, "after what I been through. "Crikey! WOT a day! Oh! WOT a day!"
When he returned he syringed the sore with Condy's fluid and I cleaned it with bits of wadding, and the woman with her nails in a way that made me shudder, but she did not seem to hurt herself. Then we put on zinc ointment. She drew her bedding from under her foot so that the water streamed through the bed to the floor, which was earthen and below the level of the door.
Dexter rose very slowly, talking gently the while to the mice, which he coaxed to his hand with a piece of cheese, and then placed them upon the floor, while he went to a corner where, turned upside down upon a slate, stood one of Dan'l's large flower-pots, the hole being covered with a piece of perforated zinc.
He now took a keen-edged chisel, and pressing the corner down proceeded to deepen the mark scored in the zinc with the greatest care, until he had cut right through, forming the metal into two moulds, one of which was to gauge the lower disc, the other the upper.
These Gatlings, which at that time were absolutely unknown in France, were not mounted, but packed in sections in sealed zinc cases, which were opened in the railway vans on the journey, the guns being there put together by a young naval officer and a couple of civilian engineers. A little later the artillery of the force was augmented.
Then connect the carbon of the end cell with one of the posts of the key, the zinc of the other end cell with one of the primary posts of the spark coil and the other primary post of the spark coil with the other post of the key, when the primary circuit will be complete.
In this valley is a fiat, or gravel-bed, which in high water is an island, or is overflown, but at the time of our visit was simply a level gravel-bed of the river. On its edges men were digging, and filling buckets with the finer earth and gravel, which was carried to a machine made like a baby's cradle, open at the foot, and at the head a plate of sheet-iron or zinc, punctured full of holes.
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