A Brief Description of the Characters of Minerals: Forming a Familiar Introduction to the Science of MineralogyH. Baillière, 1844 - 129 lappuses |
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A Brief Description of the Characters of Minerals; Forming a Familiar ... Edward John Chapman Priekšskatījums nav pieejams - 2012 |
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acuminated antimony arsenic aspect metallic assay bead bismuth blowpipe blowpipe flame blue colour borax borax and microcosmic brass candle carbonate of soda Cerium character charcoal cleavage cobalt colourless combined copper cork crust cube degree edges Feldspar flux forceps fragments fused fusible fusion glass tube globule green heat impart inch infusible intumesce Iron Pyrites lamp lateral planes lead magnet malleable metallic aspect microcosmic salt Mineralogy minerals modifications moistened Molybdenum molybdic Native Substances nitric acid Oblique octahedron odour opaque by flaming operator Oxide oxygen particles piece placed platinum platinum wire powder Practical Mineralogy prism pyramid quartz reagent reducible regular octahedron Rhombic rhombohedron shillings Silicates silver simple six-sided prism soda on charcoal solid angles soluble specific gravities streaked striæ Strontia sublimate Sulphates Sulphurets sulphuric acid surface tellurium termed terminal planes thin tint tion Titaniates titanic acid transparent truncated varieties volatilizable yellow yield
Populāri fragmenti
9. lappuse - Scratches glass, though rather with difficulty, leaving its powder on it. Yields readily to the knife. 6. Scratches glass easily. Yields with difficulty to the knife. 7. Does not yield to the knife. Yields to the edge of a file, though with difficulty. 8. 9. 10. Harder than flint.
102. lappuse - The assay, previously fused with lead, is placed in the middle of the little cupel, and the whole heated by the exterior flame. When the operation is finished, the precious metals are left on the surface of the cupel. This experiment is so delicate that grains of silver visible to the naked eye, and indeed such as may be collected by the forceps, and extended under the hammer, may in this way be extracted from the lead met with in commerce.
9. lappuse - Chapman : 1. Yields easily to the nail. 2. Yields with difficulty to the nail, or merely receives an impression from it. Does not scratch a copper coin. 3. Scratches a copper coin ; but is also scratched by it, being of about the same degree of hardness. 4. Not scratched by a copper coin ; does not scratch glass. 5. Scratches glass, though rather with difficulty, leaving its powder on it.
102. lappuse - ... the left hand with a very little soda into a thick paste. A hole is then made in a piece of charcoal, and filled with the paste, and its surface smoothed by pressure with the agate pestle. It is then to be gently heated by the blowpipe, till it is perfectly dry. (The soda only assists the cohesion, and may be omitted.) The assay, previously fused with lead, is placed in the middle of the little cupel, and the whole heated by the exterior flame.
10. lappuse - No; the specific gravity of a body, means simply its weight compared with that of another body of the same size. When we say, that substances such as lead and stones are heavy, and that others, such as paper and feathers, are light, we speak comparatively ; that is to say, that the first are heavy, and the latter light, in comparison with the generality of substances in nature.
56. lappuse - For the purpose of this discussion, the poles are designated "north" and "south." If two bar magnets are placed near each other, the north pole of one will attract the south pole of the other. There is evidence that there is a magnetic field surrounding the Earth, and this theory is applied in the design of the magnetic compass. It acts very much as though there were a huge bar magnet running along the axis of the Earth which ends several hundred miles below the surface.
85. lappuse - For the principal pafTages of the ukafe publifhed on this occaiion, the reader is referred to the appendix at the end of the volume.
101. lappuse - ... reduced to a very fine powder, a small quantity of which is to be taken on the point of a knife, moistened with the tongue, and kneaded in the left hand into a thick paste ; a little soda may be added to give it cohesion, but it is not necessary.
8. lappuse - ... 9. Corundum from India, which affords smooth cleavage surfaces. 10. The Diamond. Two other degrees are obtained by interposing foliated mica between 2 and 3, and scapolite, a crystalline variety, between 5 and 6. The former is numbered 2 '5, the latter, 5 '5.
16. lappuse - A crystal is said to be bevelled, when some or all of its edges, planes, or solid angles, are so altered as to present, in the altered part, two smaller converging planes terminating in an edge.* Or the part altered is said to be replaced by two planes : ex.