Memoirs of the Geological Survey of Great Britain and the Museum of Economic Geology in London

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H.M. Stationery Office, 1856

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Page 164 - SESSION of the GOVERNMENT SCHOOL OF MINES and of SCIENCE applied to the ARTS...
Page 93 - Chiefly a carbonate of protoxide of iron ; lustre, earthy ; colour, greenish gray ; streak, similar ; fracture, uneven, showing here and there small cavities, some of which are filled with carbonate of lime. Throughout the ore are diffused irregularly a multitude of small oolitic concretions, together with small pieces of an earthy substance resembling the ore but lighter in colour. When a mass of this ore is digested in hydrochloric acid till all carbonates and soluble silicates are dissolved, there...
Page 48 - The small quantity of sulphur (which is always suspended) is collected on a filter and thoroughly washed ; it is then incinerated at as low a temperature as possible. The residue (if any) is mixed with carbonate of soda and heated upon charcoal before the blowpipe : any globules of metal that may be obtained are dissolved and tested. Analysis of Pig Iron.
Page 46 - The filtrate from the succinate of iron was rendered alkaline by ammonia ; a few drops of bromine were added, and it was left 24 hours. The precipitate was ignited at a bright red heat and weighed as manganosomanganic oxide. 8. The insoluble portion (1) was fused with excess of the alkaline mixture obtained by decomposing Rochelle salt by heat, and washing out the mixed carbonates. The fused mass was dissolved in dilute hydrochloric acid, evaporated to dryness, the residue moistened with strong hydrochloric...
Page 227 - I cannot conceive any state of the surface, but that in which the margin of the sea was occupied by vast marine savannahs of some peat-creating plant, growing half immersed on a perfectly horizontal plain, and this fringed and interspersed with forests of trees, shedding their offal of leaves upon the marsh.
Page 227 - ... and he could not conceive of "any state of the surface adapted to account for these appearances, but that in which the margin of the sea was occupied by vast marine savannahs of some peat-creating plant, growing half immersed on a perfectly horizontal plain, and this fringed and interspersed with forests of trees, shedding their leaves on the marsh.
Page 46 - The solution (6), after precipitation of the manganese, was digested with excess of hydrochloric acid until the sulphur eliminated by decomposition of the .excess of hydrosulphate of ammonia had completely separated. The magnesia was precipitated by phosphate of soda and excess of ammonia. Generally twenty-four or forty hours were allowed for complete precipitation. The precipitate was washed with ammonia-water until no sensible residue was left by evaporation on a plate of glass, then dried, and...
Page 53 - Mem. Geol. Surv., 1856, p. 57. West Level. An altered spathose ore, in which the greater part of the carbonate has been converted into hydrated peroxide. II. A. Dick, ibid, p. 59. Rispey. Spathose ore; easily scratched by the file. No metal ppt. by H 2 S from the HC1 solution of 1,000 grains of ore. III. Dr. Percy in IL Bell. " On the Manufacture of Iron in connection with the Northumberland and Durham Coalfield.
Page 275 - Protoxide of iron Peroxide of iron Protoxide of manganese Alumina - • Lime Magnesia...
Page 142 - Peroxide of iron Protoxide of manganese Alumina . Lime . Magnesia . Carbonic acid . Phosphoric acid Bisulphide of iron Water . Organic matter Insoluble residue I.

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