Agricola, Georgius
,
De re metallica
,
1912/1950
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anyone coming at an inopportune moment might disturb his thoughts when
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they are intent on the work. </
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<
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>It is also necessary for him to place his balances
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in a case, so that when he weighs the little buttons of metal the scales may
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not be agitated by a draught of air, for that is a hindrance to his work.</
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>Now I will describe the different things which are necessary in assaying,
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beginning with the assay furnace, of which one differs from another in
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shape, material, and the place in which it is set. </
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<
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>In shape, they may be
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round or rectangular, the latter shape being more suited to assaying ores.
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</
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<
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>The materials of the assay furnaces differ, in that one is made of bricks,
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another of iron, and certain ones of clay. </
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<
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>The one of bricks is built on a
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chimney-hearth which is three and a half feet high; the iron one is placed
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in the same position, and also the one of clay. </
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<
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>The brick one is a cubit high,
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a foot wide on the inside, and one foot two digits long; at a point five digits
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above the hearth—which is usually the thickness of an unbaked
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2
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brick—
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an iron plate is laid, and smeared over with lute on the upper side to prevent
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it from being injured by the fire; in front of the furnace above the plate is a
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mouth a palm high, five digits wide, and rounded at the top. </
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<
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>The iron plate </
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<
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>A—OPENINGS IN THE PLATE. B—PART OF PLATE WHICH PROJECTS BEYOND THE FURNACE.
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has three openings which are one digit wide and three digits long, one is at
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each side and the third at the back; through them sometimes the ash falls
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from the burning charcoal, and sometimes the draught blows through the
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chamber which is below the iron plate, and stimulates the fire. </
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<
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>For this
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reason this furnace when used by metallurgists is named from assaying, but
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when used by the alchemists it is named from the wind
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3
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. </
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<
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>The part of the
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iron plate which projects from the furnace is generally three-quarters of a
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</
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</
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