493 resultados para Mezzotint engraving
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Mounted illustrations.
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Includes indexes.
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Includes index.
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IN this paper, the engraving process with Q-Switched Nd:YAG laser is investigated. High power density is the pre- requisition to vapor materials, and high repetition rate makes the engraving process highly efficient. An acousto- optic Q-Switch is applied in the cavity of CW 200 W Nd:YAG laser to achieve the high peak power density and the high pulse repetition rate. Different shape craters are formed in a patterned structure on the material surface when the laser beam irradiates on it by controlling power density, pulse repetition rate, pulse quantity and pulse interval. In addition, assisting oxygen gas is used for not only improving combustion to deepen the craters but also removing the plasma that generated on the top of craters. Off-focus length classified as negative and positive has a substantial effect on crater diameters. According to the message of rotating angle positions from material to be engraved and the information of graph pixels from computer, a special graph is imparted to the material by integrating the Q- Switched Nd:YAG laser with the computer graph manipulation and the numerically controlled worktable. The crater diameter depends on laser beam divergence and laser focal length. The crater diameter changes from 50 micrometers to 300 micrometers , and the maximum of crater depth reaches one millimeter.
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Engraved portrait of Charles Clarke Chapman, in book produced by the Historic Record Company, ca. 1911.
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Receipt from Tiffany and Co., New York for engraving on a seal, Oct. 9, 1884
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Mode of access: Internet.
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Mode of access: Internet.
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Most of the plates printed on both sides.
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At head of title: Victoria and Albert museum. Department of engraving, illustration and design.
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Mode of access: Internet.
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Avery Classics (Offsite) copy: Signed "Josephine Doughine" and bound in cover with imprint "Josephie Dougherty"; stamped "Whitlock."
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Mode of access: Internet.
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Lists of French portrait engravers and painters: p. 175-211.