Mindblown: a blog about philosophy.

  • Diazo Coatings

    Recently an entirely new technique of platemaking has found wide acceptance in the industry. This process eliminates all of the graining and surface preparation procedures encountered with regular surface plates. The manufacturer supplies a sheet of aluminum which has been grained and treated at the factory ready to be coated and processed. The nature of […]

  • Deep Etch

    Regular and copperized.—The regular method is applicable to both zinc and aluminum. The copperized plate is restricted to aluminum. The purpose of deep etch is to provide an image which is slightly below the general plane of the nonimage area. Although this depth is considered to be 0.0002 or 0.0003 of an inch deep, the […]

  • Graining

    Purpose.—By means of chemical and mechanical action, graining provides a matte finish to a flat sheet of metal. Actions of the abrasive with the driving force of the oscillating marbles provides an increased surface area Of 2 to 6 times the nominal dimensional area of the flat metal sheet. Graining also provides a capillarity which […]

  • Lithographic Platemaking

    INTRODUCTION Lithographic platemaking provides an ink-receptive positive image and an ink-resistant (desensitized) nonimage area on a plane surface. Many chemical mixtures are used to provide and develop the photo-sensitive ink-receptive image areas and render nonimage areas resistant to adherence of ink. Most metals have a natural tendency to be ink receptive and are to varying […]

  • Finishing

    Purpose.—The negatives or other film material received from the camera room are untrimmed, on larger material than page size, and cannot be used by the imposer until opaqued, trimmed to proper size, and combined with illustration material as necessary. The finishing tasks receive all of this photographic material and arrange it into uniform complete page-size […]

  • Halftone Photography

    The major requirement in reproducing copy containing various tones of gray is that such copy be changed photographically into a series of various size dots which, when printed with a black ink, will be interpreted by the eye to be various shades of gray. To accomplish this variety of dots, two types of halftone screens […]

  • Copy Preparation

    STATEMENT OF GENERAL FUNCTIONS OF OFFSET COPY PREPARATION Offset Copy Preparation, as a function in the Government Printing Office, serves as the inspector and judge for all reproducible materials used in lithographic production. This range of materials includes cold-type copy; reproduction proofs of metal composing; line art; photographs; manuscript copy for phototypesetting or metal composition; […]

  • Obsolete And Emergency Currencies

    OBSOLETE PAPER CURRENCY THE paper currency that was issued by the Colonies became so depreciated in value during the Revolutionary War, as a result of the inability to honor it by payment in specie, that at the close of the war its value was a matter of much doubt. Redemption of the colonial currency by […]

  • Early History About Federal Reserve Notes

    NEED FOR AN ELASTIC CURRENCY IN PREVIOUS chapters four of the five kinds of paper currency in circulation have been discussed and it was shown that the basis of each of them differs from the others. The fifth class, which is the Federal reserve note, likewise differs from the other four. This note is similar […]

  • Early History About National Bank Notes

    IN PREVIOUS chapters the United States paper currency and the gold and the silver certificates have been discussed. The basis of each of those three classes of money was set forth with the object of making it clear that each stands on a solid foundation. It was shown why each class passes at par and […]

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