Thus an alloy of zinc and tin in the proportions of about 92 per cent tin and 8 per cent zinc may be melted on absolutely clean glass, and will adhere strongly to it if well rubbed by an asbestos crayon.
The art of soldering zincis a very useful one in the laboratory.
In any case, it is very certain that chloride of zinc left in a joint will ruin it sooner or later by loosening the contact between copper and solder.
The iron must be filed clean and then brushed with chloride of zinc solution.
This process resembles that last described, but instead of spelter an alloy of silver, copper, and zinc is employed.
The property of softening at a moderate temperature is invaluable as a means of flattening zinc plate or shaping it in any way.
One gallon of water and one pound of sulphuric acid are mixed with one or two ounces of zinc (which of course dissolves); to this is added half a pound of nitric acid.
The fluxes most generally employed are tallow for lead, resin or Venice turpentine for copper, chloride of zinc for anything except lead, which never requires it.
It is a remarkable property of all nickel alloys containing zinc that their specific resistance is permanently increased by heating, whereas alloys which do not contain zinc suffer a change in the opposite direction.
However, it is agreed on all hands that when chloride of zinc is used it must be carefully washed off.
Spelter is soft brass, and is generally made from zinc one part, copper one part; an alloy easily granulated at a red heat; it is purchased in the granular form.
A shorter and more usual method is carried out as follows: The solution of chloride of zinc is prepared by adding bits of zinc to some commercial hydrochloric acid diluted with a little (say 25 per cent) of water.
In the laboratory the chief application of the process is to copper soldering during the construction of electrical apparatus and to zinc soldering for general purposes.
Care was taken that the pairs were introduced all looking one way, so that a copper plate had always a zinc plate immediately opposite to it.
The quantity of cadmium which he was able to obtain from this oxide of zinc was but small.
Now as the sulphur and oxides of zinc and antimony could furnish no earthy matter, no other source remains but the water with which the plants were fed, and the atmosphere with which they were surrounded.
While discharging the duties of his office at Hildesheim, in the year 1817, he found that the carbonate of zinc had been substituted for the oxide of zinc, ordered in the Hanoverian Pharmacopœia.
They then attached a gold wire to the zinc end of the pile, and another gold wire to the copper end, and plunged the two wires into a glass of water, taking care not to allow them to touch each other.
They ascertained that the zinc end of the pile was positive and the copper end negative.
On collecting that from the wire attached to the zinc end, it was found to be oxygen gas, while that from the copper end was hydrogen gas.
This carbonate of zinc was manufactured at Salzgitter.
In this way there are fifty pairs of zinc and copper plates in contact, each separated by a piece of wet card, which is a conductor of electricity.
Suspend the zinc and wire in the solution which has been prepared; in a short time, metallic lead will deposit itself on the zinc and along the wire.
If a piece of zinc and copper joined by a wire be dipped in a liquid--generally weak sulphuric acid--which will act chemically on the metals, a current is produced.
Thin sheets of zinc are also used to cover roofs of houses, and in the manufacture of various household utensils.
Covering the floors with sheets of zinc will promote cleanliness.
Bathing the shoulders with the following preparation is a useful preventive measure: lead acetate four ounces, zinc sulfate three ounces and water one gallon.
One part zinc oxide and twelve parts vaseline is a useful ointment.
Sore teats may be treated by applying the following ointment after each milking: vaseline ten parts and oxide of zinc one part.
As an astringent, sulphate or chloride of zinc may be tried, in the proportion of 1 grain to the ounce; or the cavity may occasionally be washed out with a 2% solution of argyrol or nitrate of silver.
The battery gives off fumes which can be condensed into a nitrogenous substance, valuable, it is stated, as a manure, while the zinc salts in the spent liquid can be recovered and returned to useful purposes.
Copper and zinc produce in this manner an induced current of greater length than metals of lower conductivity, with the exception of iron, which gives an induced current of extremely short duration.
To do this, dry the edges of the cover thoroughly with bibulous paper, and paint a layer of gold size, allowing it to overlap the cover an eighth or sixteenth of an inch, then cover this with white zinc cement.
A pumping engine that is remarkable for its size and peculiarities of construction is located at the Lehigh zinc mine, at Friedensburg, Pa.
A little plate of zinc has fallen to his lot, and his name has been patiently stippled, doubtless with the help of a hammer and a nail.
Zinc may be grained and drawn upon in the same way; why this metal is not more generally used, I do not know, for it is much lighter, more portable, and can be easily mounted on a plain stone to print from.
The blocks may be of zinc or copper or other metal, and all sorts of chemicals are used.
Or else the photographic print is made on the varnish itself just exactly in the same way as for a zinc block; only in this case the picture is washed away and not the surrounding portions; the biting is then proceeded with.
Since these lectures were last given, the method of etching zinc and copper half-tone blocks has been entirely revolutionised.
This negative thus obtained is printed on to the zinc or copper plate, is then etched much as in the case of the simple line block.
It makes the zinc act like pure zinc, which is not acted upon by dilute sulphuric acid when the current does not pass.
The zinc plate should be raised when the cell is not in use, to keep it from being uselessly dissolved.
In the simple cell the zinc is the + plate, and the copper the negative (-) plate.
The return wire, R W, passes from the copper of b to the zinc of B.
A little mercury is placed in the porous cup to keep the zinc well amalgamated.
The zinc plate is supported about four inches above the copper, and is surrounded by a solution of zinc sulphate which floats upon the top of the blue solution.
The zinc is gradually dissolved, and it is this chemical burning of the zinc that furnishes energy for the electric current in the simple cell.
This is largely overcome by coating the zinc with mercury.
A carbon rod is inclosed in a porous cup, on the outside of which is a cylinder of zinc that stands in dilute sulphuric acid, the carbon being in nitric acid.
The hydrogen acts like a metal and sets up a current that opposes the zinc to the copper current.
This tends to eat away the zinc without producing useful currents.
In the cell the current passes from the zinc to the copper; that is, from the positive to the negative plate, where bubbles of hydrogen gas are deposited.
By connecting the first zinc and the last copper, quite a little current was produced.
Sal ammoniac is used as the exciting fluid, carbon and zinc being used for plates.
It furnishes a large quantity of current, and as the zinc can be raised from the fluid, it may be kept charged ready for use for many months, and can be set in action any time when required by lowering the zinc into the liquid.
Thus the yellow powder sulphide of zinc bursts into a brilliant glow under the stimulus of radium emanations, and to make it clear that this effect is due to the emanations and not to the rays M.
The leg whose nerve was tied, remained paralytic during this time, but when it was laid upon zinc and excited with silver, it contracted as strongly as the other.
With zincand gold, I think, it is strongest; next so with zinc and silver, or molybdena, and insufferably disagreeable with any of them.
While I held the probe which supported the nerve, I touched the shoe of a gentleman, who applied the zinc to the silver under the foot of the frog.
Thrust in a rod of zinc between thezinc and the cheek, and a rod of silver between the silver and the other cheek.
I applied the zinc there, and an extensive surface of silver to the tongue.
I had a number of pieces of zinc made of the size of a shilling, and made them up into a rouleau, with as many shillings.
I made a piece of zinc having a sharp point, projecting laterally from its end.
When the zinc touches in an extensive surface, the irritation produced by a narrow contact of the silver is very distinct, especially on the upper side of the tongue, and along its margin.
If the abdomen of a frog be filled with it, a piece of zinc passed through it, so as to touch the sciatic nerves, excites contractions.
After several hours the deposit is detached from the mould and backed by pouring in melted solder, the surface being first moistened with chloride of zinc to make the solder adhere.
An injection of sulphate of zinc into the blood-vessels is also stated to be satisfactory; while natron, various spices, and other aromatic compounds are sometimes employed.
By this means zinc ions are carried into the ulcer.
In these processes the solution used consists either of zincsulphate or of zinc chloride, the anodes consisting of metallic lead or of carbon, and the cathodes of pure zinc sheets.
The production of electrolytic zinc from solutions has been encouraged as a result of the shortage of purezinc for war purposes, and several processes have been developed.
Thus in the treatment of rodent ulcer, a pad of lint saturated with a 5 per cent solution of zinc sulphate is placed over the ulcer.
A zinc electrode is placed on the pad and connected to the positive pole of the supply.
The application of the blast furnace to copper, lead, and zincsmelting was chiefly made in America.
The metallurgy of lead, copper, and zinc has reached a similar high plane to that attained by iron and steel.
A piece of zinc introduced, for example, into pure water gives birth to a few metallic ions.
By means of a magnifying glass, a screen covered with sulphide of zinc is kept under observation, and in front of it is disposed, at a distance of about half a millimetre, a fragment of some salt of radium.
The fallacy of this theory was soon demonstrated by a few coarse experiments, made on small quantities of this gas procured, in the first instance, from zinc and diluted nitrous acid.
Zinc is found in association with gold, silver, and copper, and, though valuable, is quite an impediment to the mining of the gold and silver.
One interesting fact connected with the mining industry in the lake country is that at Nelson is located an electric zinc smelter, the only one of the kind in the world.
Zinc blend and galena may occupy the same vein, which is likely to be of baryta or heavy spar.
Zinc amalgam is prepared as follows: Cut zinc-sheet into small pieces; wash in weak sulphuric acid; and dissolve in mercury.
Galena and zinc blende frequently resemble one another, but they may be distinguished by this infallible sign: the powder of galena is black, and that of blende brown, or yellow.
Zinc is derived mainly from the following half dozen ores: Zinc.
Calamine or silicate of zinc is the great producing ore.
Other zinc ores are merely curiosities and do not affect the commercial value of the metal.
Brittle buttons may be due to arsenic, antimony, zinc or litharge, and must be re-scorified before cupellation, with more lead.
At any rate, these deposits now have great economic value, and the lead and zinc ore is easily got at.
Zinc amalgam (preferable when mine water containing sulphuric acid is used in the battery) is applied to the plate after it has been cleaned with a moderately dilute mixture of sulphuric acid and water.
In the New Jersey mines the zinc ores are the oxides zincite and willemite, and the zinc-iron oxide franklinite.
The so-called steel galena which carries a little zinc is generally richer in silver than the ordinary cube galena, though the reverse is sometimes the case.
He discussed in a very practical mind the question of miners' wages, and thought that the Bleymard zinc workers were better off with four francs a day than English miners with five or six shillings.
It appeared that the Frenchmen were concerned in the zinc mines near Bleymard, him of the oily clothes being chief engineer, the other business manager.
The city has large zinc smelters and zinc rolling-mills, a foundry, machine shops, and manufactories of cement, sulphuric acid and brick.
The first mines to be worked in Iowa were those for lead and zinc at Dubuque and to the northward.
Some prefer an aquarium with glass on all sides, and where this is the case the framework may be made of angle zinc with all the joints strongly soldered.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "zinc" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: gold; iron; lead; metal; silver
