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Otis King Slide Rule. Early Logarithmic Calculator Model 'L'. 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 1930’s. 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 B (with a screw as cursor), model L, with scales 429 and 430 and early serial number G378, It is in very good condition in its original box and comes with a Otis king original old type 8 page instruction manual. |
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