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Standard Slide Rules

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Most standard slide rule sizes are 6, 10, 12 inches in length. There are a few larger ones of 22 and 24 inches. Some were made mainly for classroom and demonstration purposes. These are typically 3 - 6 feet in length (Approx: 1 - 2 metres). The majority of slide rules have 4 main scales A, B, C, D. Others have many more.