Agricola, Georgius
,
De re metallica
,
1912/1950
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>A—PESTLE WITH TEETH. B—PESTLE WITHOUT TEETH. C—DISH OR TRAY FULL OF ASHES.
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D—PREPARED TESTS PLACED ON BOARDS OR SHELVES. E—EMPTY TESTS. F—WOOD.
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G—SAW.
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little powder is again moistened, and thrown into the test, and tamped; this
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work is repeated until the test is entirely full of the powder, which the
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master then cuts out with a knife, sharp on both sides, and turned upward at
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both ends so that the central part is a palm and a digit long; therefore it is
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partly straight and partly curved. </
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>The blade is one and a half digits wide,
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and at each end it turns upward two palms, which ends to the depth of a
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palm are either not sharpened or they are enclosed in wooden handles. </
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<
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>The
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master holds the knife with one hand and cuts out the powder from the test,
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so that it is left three digits thick all round; then he sifts the powder of dried
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bones over it through a sieve, the bottom of which is made of closely-woven
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bristles. </
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>Afterward a ball made of very hard wood, six digits in diameter,
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is placed in the test and rolled about with both hands, in order to make the
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inside even and smooth; for that matter he may move the ball about with only
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one hand. </
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<
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>The tests
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are of various capacities, for some of them when prepared </
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