Agricola, Georgius, De re metallica, 1912/1950

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            <p type="main">
              <s>
                <pb pagenum="285"/>
              way; the lower part of the head is three palms long and the upper part the
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              same length. </s>
              <s>The lower part is a palm square in the middle for two palms,
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              then below this, for a length of two digits it gradually spreads until it
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              becomes five digits square; above the middle part, for a length of two
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              digits, it again gradually swells out until it becomes a palm and a half square.
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              </s>
              <s>Higher up, where the head of the shoe is enclosed in the stem, it is bored
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              through and similarly the stem itself is pierced, and through the opening of
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              each, there passes a broad iron wedge, which prevents the head falling off the
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              stem. </s>
              <s>To prevent the stamp head from becoming broken by the constant
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              striking of fragments of ore or rocks, there is placed around it a quadrangular
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              iron band a digit thick, seven digits wide, and six digits deep. </s>
              <s>Those who
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              use three stamps, as is common, make them much larger, and they are
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              made square and three palms broad each way; then the iron shoe
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              of each has a total length of two feet and a palm; at the lower end, it is
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              hexagonal, and at that point it is seven digits wide and thick. </s>
              <s>The lower
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              part of it which projects beyond the stem is one foot and two palms long;
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              the upper part, which is enclosed in the stem, is three palms long; the </s>
            </p>
            <figure number="153"/>
            <p type="caption">
              <s>A—STAMP. B—STEM CUT OUT IN LOWER PART. C—SHOE. D—THE OTHER SHOE,
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              BARBED AND GROOVED. E—QUADRANGULAR IRON BAND. F—WEDGE. G—TAPPET.
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              H—ANGULAR CAM-SHAFT. I—CAMS. K—PAIR OF COMPASSES.</s>
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