Agricola, Georgius
,
De re metallica
,
1912/1950
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31 - 60
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<
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pagenum
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362
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building there should be, besides the four long walls, seven transverse walls,
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of which the first is constructed from the upper end of the first long wall to
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the upper end of the second long wall; the second proceeds from the end
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of this to the end of the third long wall; the third likewise from this end of
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the last extends to the end of the fourth long wall; the fourth leads from
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the lower end of the first long wall to the lower end of the second long wall;
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the fifth extends from the end of this to the end of the third long wall; the
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sixth extends from this last end to the end of the fourth long wall; the
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seventh divides into two parts the space between the third and fourth long
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walls.</
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<
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>To return to the back part of the building, in which, as I said, are the
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bellows
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6
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, their frames, the machinery for compressing them, and the instru
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ment for distending them. </
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<
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>Each bellows consists of a body and a head.
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</
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<
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>The body is composed of two “boards,” two bows, and two hides. </
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<
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>The
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upper board is a palm thick, five feet and three palms long, and two and a half
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feet wide at the back part, where each of the sides is a little curved, and it is
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a cubit wide at the front part near the head. </
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>
<
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>The whole of the body of the
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bellows tapers toward the head. </
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>
<
s
>That which we now call the “board”
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consists of two pieces of pine, joined and glued together, and of two strips of
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linden wood which bind the edges of the board, these being seven digits
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wide at the back, and in front near the head of the bellows one and a half
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digits wide. </
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<
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>These strips are glued to the boards, so that there shall be less
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damage from the iron nails driven through the hide. </
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>
<
s
>There are some people
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who do not surround the boards with strips, but use boards only, which
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are very thick. </
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>
<
s
>The upper board has an aperture and a handle; the
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aperture is in the middle of the board and is one foot three palms distant
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from where the board joins the head of the bellows, and is six digits long and
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four wide. </
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>
<
s
>The lid for this aperture is two palms and a digit long and wide,
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and three digits thick; toward the back of the lid is a little notch cut
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into the surface so that it may be caught by the hand; a groove is cut out
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of the top of the front and sides, so that it may engage in mouldings a palm
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wide and three digits thick, which are also cut out in a similar manner under
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the edges. </
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>
<
s
>Now, when the lid is drawn forward the hole is closed, and
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when drawn back it is opened; the smelter opens the aperture a little so that
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the air may escape from the bellows through it, if he fears the hides might be
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burst when the bellows are too vigorously and quickly inflated; he, however,
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closes the aperture if the hides are ruptured and the air escapes. </
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>
<
s
>Others
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perforate the upper board with two or three round holes in the same place as
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the rectangular one, and they insert plugs in them which they draw out </
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</
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</
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