Iron rust sometimes contains magnetite.
Copper rust has the same composition as malachite; it results from the action of carbon dioxide and water on the metal.
As if on cue, an old car with more rust than clear metal chugged to a stop at the dollar store.
The following are the requirements of the New York building law in regard to the protection of iron or steelwork against corrosion, &c.: " All structural metal-work shall be cleaned of all scale, dirt and rust, and be thoroughly coated with one coat of paint.
It is not brittle like porcelain and cast iron, not poisonous like lead-glazed earthenware and untinned copper, needs no enamel to chip off, does not rust and wear out like cheap tin-plate, and weighs but a fraction of other substances.
In Australia, for instance, the berberry is an imported plant and of rare occurrence, yet rust is very abundant.
(After De Bary.) uredospores probably survive the winter in Europe as well as in Australia and give rise to the rust of the following year.
Inch of concrete to preserve them from damage by rust or fire.
Other examples in which buff or rust-colour predominates have also been deemed distinct, and to those has been applied the epithet russata.
The absence of iron and the abundance of bronze in the relics of a prehistoric people is a piece of evidence to be accepted with caution, because the great defect of iron, its proneness to rust, would often lead to its complete disappearance, or conversion into an unrecognizable mass, even though tools of bronze originally laid down beside it might remain but little corroded.
Owing to the presence of oily globules of an orange-yellow or rusty-red colour in their hyphae and spores they are termed Rust-Fungi.
20 (1906); Ward, "The Brooms and their Rust Fungus," Ann.
Rust, in their cell-walls.
The first requirement, therefore, for efficient painting is the careful removal of all mill-scale, rust, grease, or foreign substance, before even the priming coat is applied.
The city has parks, including Hoyt Park (27 acres), used for athletic sports, Rust Park (150 acres), occupying an island in the river, and Riverside Park, a pleasure resort.
Ferric oxide or iron sesquioxide, Fe203, constitutes the valuable ores red haematite and specular iron; the minerals brown haematite or limonite, and gothite and also iron rust are hydrated forms. It is obtained as a steel-grey crystalline powder by igniting the oxide or any ferric salt containing a volatile acid.
Of these the rust, smut and bunt fungi are by far the most common and the most destructive.
Rust alone is said to cause an annual loss of wheat in India amounting to from 4,000,000 to 20,000,000 rupees.
In spring, while the wheat plants are still green and immature, the rust makes its appearance as orange-red spots or streaks on the stalks and leaves.
Rust disease does not directly affect the grains, but both quantity and quality are impaired by the exhausted condition of the wheat plants.
Rust, a word which appears in many Teutonic languages, cf.
Formerly the process was regarded as oxidation pure and simple, and, although it was known that iron did not rust in dry air, yet no attempt was made to explain why water was necessary to the action.
Moody has since shown that when all traces of carbon dioxide are removed (which is a matter of great experimental difficulty) iron may be left in contact with oxygen and water for long periods without rust appearing, but on' the admission of carbon dioxide specks are rapidly formed.
It also appears that rust changes in composition on exposure to the atmosphere, both the ferrous oxide and carbonate being in part oxidized to ferric oxide.
The materials mixed with the iron borings cause them to rust into a solid mass, and in doing so a slight expansion takes place.
Suitable proportions of materials to form a rust joint are 90 parts by weight of iron borings well mixed with 2 parts of flowers of sulphur, and I part of powdered sal-ammoniac. Another joint, less rigid but sound and durable, is made with yarn and white and red lead.
The epidemic nature of wheat-rust was known to Aristotle about 350 B.C., and the Greeks and Romans knew these epidemics well, their philosophers having shrewd speculations as to causes, while the people held characteristic superstitions regarding them, which found vent in the dedication of special festivals and deities to the pests.
White or grey spots may be due to Peronospora, Erysiphe, Cystopus, Entyloma and other Fungi, the mycelium of which will be detected in the discoloured area; or they may be scale insects, or the results of punctures by Red-spider, &c. Yellow spots, and especially bright orange spots, commonly indicate Rust Fungi or other Uredineae; but Phyllosticta, Exoascus, Clasterosporium, Synchytrium, &c., also induce similar symptoms. Certain Aphides, Red-spider, Phylloxera and other insects also betray their presence by such spots.
For instance, the difference between the long-stalked and finely-cut leaves of Anemone attacked with rust and the normal leaves with broad segments, or between the urceolate leaves occasionally found on cabbages and the ordinary formin these cases undoubtedly pathological and teratological respectivelyis nothing like so great as between the upper and lower normalleaves of many Umhelliferae or the submerged and floating leaves of an aquatic Ranunculus or Cabomba.
The Ascomycetes, Rust Fungi, &c., the same structure obtains so far as all essential details are concerned.
The first biographer of Jeremy Taylor was his friend and successor, George Rust, who preached a funeral sermon (in 1668) which remains a valuable document.
Many substances were employed in ancient medicine: galena was the basis of a valuable Egyptian cosmetic and drug; the arsenic sulphides, realgar and orpiment, litharge, alum, saltpetre, iron rust were also used.
If the rust so covered up has not begun to pit the iron the chances are that it will do no harm; but, if it is already well developed and of some thickness, it will have enough oxidizing agents in its pores to develop more oxide, and to swell up and crack the paint.
(3) A most important difference is observable in the liability to attacks of rust (Puccinia), some varieties being almost invariably free from it, while others are in particular localities so subject to it as to be not worth cultivating.
A blue-green tint shone through the sunlight while frozen waterfalls, hanging from the upstream cliffs, bore a hint of the rust-orange hue from the natural deposits of Red Mountain above.
What then happened was very natural: imitations of the old wares were produced, and having been sufficiently disfigured by staining and other processes calculated to lend an air of rust and age, they were sold to ignorant persons, who labored under the singular yet common hallucination that the points to be looked for in specimens from early kilns were, not technical excellence, decorative tastefulness and richness of color, but dinginess, imperfections and dirt; persons who imagined, in short, that defects which they would condemn at once in new porcelains ought to be regarded as merits in old.
Uromyces Erythronii, a rust, sometimes causes considerable injury to the foliage of species of Lilium and other bulbous plants, forming large discoloured blotches on the leaves.
They are exceedingly thin, but being buried in concrete no danger of their perishing from rust is to be feared.
Its versatile cries and actions, as seen and heard by those who penetrate the solitude of the northern forests it inhabits, can never be forgotten by one who has had experience of them, any more than the pleasing sight of its rust-coloured tail, which an occasional gleam of sunshine will light up into a brilliancy quite unexpected by those who have only surveyed the bird's otherwise gloomy appearance in the glass-case of a museum.
This period of open-air exposure allows the process of rust to start under the scales.
The Chicago ordinance makes no mention of paint or coating to prevent rust in metal framework.
The rust fungus, Puccinia graminis, is a Uredine belonging to the heteroecious group, that is, one that passes from one host to another at different stages of its life-history.
Much attention has been paid recently to the cultivation of varieties of wheat that are immune to rust attacks, and care should be taken to select strains that have been proved able to resist the disease.
Throughout this time, Borlaug constantly battled wheat's arch-nemesis: rust, a fungus that feeds on wheat, oats, and barley.
The joint most commonly used for hot-water pipes is termed the " rust " joint, which is cheap to make, but unfortunately is inefficient.
Why should I rust in inactivity?
In winter of a nearly uniform ash-grey above and white beneath, in summer the feathers of the back are black, with deep rust-coloured edges, and a broad black belt occupies the breast.