Definitions
from The Century Dictionary.
- noun A loose earthy deposit formed by the infiltration of water and its solvent action on rock material.
from the GNU version of the Collaborative International Dictionary of English.
- noun A loose, earthy deposit from water, found in the cavities or clefts of rocks, mostly white, but sometimes red or yellow, from a mixture of clay or ocher.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A loose,
earthy deposit fromwater , found in thecavities orclefts ofrocks , mostly white, but sometimes red or yellow, from a mixture ofclay orochre .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The time occupied in calcining will depend of course upon the quality of the guhr being operated upon.
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The temperature should be sufficiently high to make the guhr red hot, or the organic matter will not be burnt off.
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The guhr is generally dried in a reverberatory muffle furnace.
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If water is brought into contact with it, the nitro-glycerine is gradually displaced from the silica (guhr).
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A good guhr should absorb four times its weight of nitro-glycerine, and should then form a comparatively dry mixture.
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A sample of the calcined guhr should not contain more than 0.5 per cent. of moisture and organic matter together.
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In this case a small quantity of barium sulphate, say about 1 per cent., should be added to the guhr.
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The dry guhr can, of course, be examined, either qualitatively or quantitatively, for other mineral salts, such as carbonate of soda, &c. An actual analysis of dynamite No. 1 made by the author at Hayle gave --
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In a series of lead-lined tanks the guhr is weighed, placed in a tank, and the nitro - glycerine poured on to it.
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After the guhr is dry it requires to be sifted and crushed.
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