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The Invention of Lithography
img img The Invention of Lithography img Chapter 28 GYRATING SCRAPER AND DOUBLE LEVER PRESSES
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Chapter 28 GYRATING SCRAPER AND DOUBLE LEVER PRESSES

I have already mentioned the gyrating scraper press. I have improved it considerably. It has the form of the ordinary lever press, but all the parts can be much lighter. For instance, the lever is only one and a half inches thick. The spring (the elastic board) is very elastic and need exert a pressure of only one hundred pounds. The little scraper

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