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This is a logarithmic cylindrical pocket slide rule with helical scales to add subtract multiply and divide numbers, made in England by Carbic ltd., London in the early 1960s. The model L has a linear scale section on the top. A linear scale on a slide rule is used to find logs and anti-logs, which can be used along with multiplication and division to do arbitrary powers and roots. This slide rule is a type C, model L, with scales 429 and 430 and number T5661, It is in good condition in its original leather pouch. |
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