These are made of alternate layers of soft wrought iron and chrome steel hardened by sudden cooling.
There are many other valuable ores - copper, iron, lead, zinc, antimony, chrome and manganese.
The hardness of the hardened chrome steel resists the burglar's drill, and the ductility of the wrought iron the blows of his sledge.
The other minerals found in the concentrates are pebbles and fragments of pyrope, zircon, cyanite, chrome-diopside, enstatite, a green pyroxene, mica, ilmenite, magnetite, chromite, hornblende, olivine, barytes, calcite and pyrites.
The yearly output of nickel and chrome is considerable, and these minerals, with cobalt, constitute the characteristic wealth of the island.
It is used as a pigment under the name "chrome yellow."
In the Gundagai district the industry was rapidly becoming a valuable one, but the low price of chrome has greatly restricted the output.
The purple-blue of cobalt, the chrome green or yellow of chromium, the dichroic canarycolour of uranium and the violet of manganese, are constant.
The native chrome-ironstone (Cr 2 O 3 FeO) may be used in this way as a source of such compounds, being fused in a reverberatory furnace, along with soda-ash and lime, the oxidizing agent in this case being atmospheric oxygen.
Salonica exports grain, flour, bran, silk cocoons, chrome, manganese, iron, hides and skins, cattle and sheep, wool, eggs, opium, tobacco and fennel.
Arlington is an important centre for market-gardening (in hot-houses), and along Mill Brook, in the township, are several factories, including chrome works, a large mill and a manufactory of pianoforte cases.
Oxide of chromium and chrome iron ore have been proposed as refractory crucible materials.
In unlimited supply, important deposits of rich iron ores suitable for smelting purposes; and for the manufacture of steel of certain descriptions abundance of manganese, chrome and tungsten ores are available.
There are mines of chrome, mercury, cinnabar, argentiferous lead and rock salt.
Softens a spot on a hardened carbon steel or chrome steel safe by simply heating it, so that as soon as it has again cooled he can drill through it and introduce his charge of dynamite.
Dean and Sackler drove about a mile down old Route 22 to a chrome and Formica railroad-car diner straight out of the fifties.
Bosnia is rich in minerals, including coal, iron, copper, chrome, manganese, cinnabar, zinc and mercury, besides marble and much excellent building stone.
Lead chromate, PbCrO 4, is prepared industrially as a yellow pigment, chrome yellow, by precipitating sugar of lead solution with potassium bichromate.
Chrome-tungsten or High-speed Steel.-Steel with a large content of both chromium and tungsten has the very valuable property of " red-hardness," i.e.
For example, episomorphs of white potash alum and violet chrome alum, of white magnesium sulphate and green nickel sulphate, and of many other pairs of salts, have been obtained.
The concessions are to be for 99 years with the exception of chrome, emery, boracite and other minerals found only in the form of deposits, which may be granted for not less than 40 years or more than 99 years.
The island imports wines, spirits, tissues, clothing and ironmongery; and exports ores, nickel, cobalt and chrome (which represent over three-quarters of the total exports in value), preserved meats and hides, coffee, copra and other colonial produce.
Ostwald (ibid., 1900, 35, pp. 33, 204) has observed that on dissolving chromium in dilute acids, the rate of solution as measured by the evolution of gas is not continuous but periodic. It is largely made as ferro-chrome, an alloy containing about 60-70% of chromium, by reducing chromite in the electric furnace or by aluminium.
Recoura, Annales de, Chimie et de Physique, 1895 (7), 4, p. 505.) Chromic sulphate combines with the sulphates of the alkali metals to form double sulphates, which correspond to the alums. Chrome alum, K2S04 Cr2(S04)3.24H20, is best prepared by passing sulphur dioxide through a solution of potassium bichromate containing the calculated quantity of sulphuric acid, K 2 Cr 2 O 7 -}-3SO 2 +H 2 S04 = H20+K2S04 4-Cr2(S04) 3.
By adding sodium phosphate to an excess of chrome alum the violet phosphate, CrP04.6H 2 O, is precipitated; on heating to 100° C. it loses water and turns green.
The chief ones are nickel steel, manganese steel, chrome steel and chrome-tungsten steel.
Chrome steel, which usually contains about 2% of chromium and o 80 to 2% of carbon, owes its value to combining, when in the " hardened " or suddenly cooled state, intense hardness with a high elastic limit, so that it is neither deformed permanently nor cracked by extremely violent shocks.
The boulder is a crystalline rock consisting of pyroxene (chrome-diopside), garnet, and a little olivine, and is studded with diamond crystals; a portion of it is preserved in the British Museum (Natural History).
Mayflies and dragon-flies danced in the sunlight; lizards darted across the paths; and legions of spiders pervaded the grass, many very beautiful - frosted - silver backs, or curious, like the saltigrades, who took a few steps and then gave a leap. There were crickets in infinite numbers; and flies innumerable, from slim daddy-long-legs to ponderous, black, hairy fellows known to science as Dejeaniae; hymenopterous insects in profusion, including our old friend the bishop of Ambato (possibly Dielis), in company with another formidable stinger, with chrome antennae, called by the natives ` the Devil '; and occasional Phasmas (caballo de palo) crawling painfully about, like animated twigs."
Chrome alum, K 2 SO 4 ï¿½Cr 2 (SO 4) 3.24H 2 O, appears chiefly as a by-product in the manufacture of alizarin, and as a product of the reaction in bichromate batteries.
The iron deposits are very extensive, and the ores consist of red haematites, magnetites, titanic, chrome and manganese irons.
When digested for some time with a caustic alkali it is converted into a basic salt, PbCrO 4 PbO, a pigment known as "chrome red."
It is rich in minerals, including chrome, manganese, zinc, antimony, iron, argentiferous lead, arsenic and lignite, but some of these are unworked.
Another point to which attention is directed is the exceptionally great effect which hardening has upon the magnetic properties of chrome steel; one specimen had a coercive force of 9 when annealed, and of no less than 38 when oilhardened.
OH or Cr203 H20 which occurs naturally as chrome ochre.