In order to realize the vast work in solution and cementation which underground waters are now doing and have done in all geological ages, we must gain some conception of their amount.
Thus below the zone of solution where the work of water is to dissolve, lies the zone of cementation where its work is chemical deposit.
As the land surface is gradually lowered by weathering and the work of rain and streams, rocks which have lain deep within the zone of cementation are brought within the zone of solution.
The so-called secondary enrichment of many valuable veins is merely one of the special phases of cementation from a superficial source.
By cementationsome of the common rocks, especially the sediments, become sufficiently compact and strong to be useful as commercial products, such as building stones and road materials.
Dynamic and contact metamorphism may in some cases produce rocks identical in appearance with those produced by ordinary processes of cementation and recrystallization without movement.
In general, openings in rocks tend to diminish with depth, due to cementation and to closing of cavities by pressures which are too great for the rock to withstand.
The former term is also applied to less profound changes in connection with igneous intrusions, which result merely in cementation without mashing.
A special phase of consolidation and cementation is produced near intrusive igneous rocks through the action of the heat and pressure and the expelled substances of the igneous rock.
This brass is made by the cementation of copper plates with calamine, and hammered out into leaves.
Steel of cementation is formed, on a large scale, by stratifying bars of iron with charcoal, in large earthen troughs or crucibles, the mouths of which are closed with clay.
After cementation the plate is heated to a certain temperature and is then plunged into an oil bath in order to toughen it.
Slow preparation of the steel by cementationor in crucibles meant a disproportionate consumption of fuel and a resulting high cost.
To dissolve Silver, and separate it from Gold, by Cementation 258 CHAP.
In fact, a series of hybrid methods between absolute melting with sulphur and cementation with salt, were in use, much like those mentioned by Agricola on p.
He also gives the method of parting with antimony and sulphur, and by cementation with common salt.
That it refers to cementation at all hangs by a slender thread, but it seems more nearly this than anything else.
As to cementation with salt, however, we have some data at about the beginning of the Christian Era.
Amalgamation); and it appears to us that gold was parted from silver by cementation with salt prior to the Christian era.
While nitric acid will only part gold and silver when the latter is in great excess, yet when applied as fumes undercementation conditions it appears to react upon a minor ratio of silver.
That these movements were separated by a considerable interval of time is shown by the fact that the re-cementation of the fragmental products of the first movement preceded the second.
By some chemists, cyanogen compounds are supposed to be present in the cementation powder, and the cyanogen contained in these is supposed to be the carrier of the carbon to the iron.
Steel made by this operation is entirely homogeneous, the tilting process which precedes the casting of the steel obtained by cementation is therefore unnecessary.
The copper obtained by any of the above processes is called 'cementation copper.
The precipitation of metallic copper from the solution of its chloride is accomplished in large tanks by means of metallic iron in the same way that cementation copper is obtained from solutions of the sulphate.
This steel is very irregular in its interior texture, has a white colour, like frosted silver, and displays crystalline angles and facettes, which are larger the further the cementation has been urged, or the greater the dose of carbon.
This treatment converts the external part into a coating of steel, which is usually very thin, because the time allowed for the cementation is much shorter than when the whole substance is intended to be converted.
The steel so produced is of excellent quality; but the process does not seem to be so economical as the ordinary cementationwith charcoal powder.
This is an easy way of making cast-steel without previous cementation of the iron.
A manufactory of steel existed in Sweden as early as 1340 of the Christian era: but it is generally thought, that the process of converting iron into steel by cementation originated in England, at a later period.
The progress of the cementation is discovered by drawing a test bar from an aperture in the side.
Cementation is often employed by goldsmiths, to refine the surface of articles in which the gold has been combined, in too small a proportion, with metals of less value.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cementation" in a variety of sentences. We hope that you will now be able to make sentences using this word.
