Vintage Otis King's Pocket Calculator, Cylindrical Slide Rule

Here is a vintage Otis King's Pocket Calculator, cylindrical slide Rule, new old stock never used. Comes with original boxes, case, insert and instructions. Made in England. 

Otis King's Pocket Calculator is compact cylindrical variation on the slide rule. At the base is a cylindrical handle with a logarithmic scale that spirals around it. There is an opaque tubular sleeve around this with a marker that you can set to any point on the scale. Out of the other side of this marker tube is another cylinder, again with a logarithmic scale, which can be moved independently, and also be set to align with another marker on the sleeve.

Instructions are slightly discoloured from age and storage. 

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Although we try to give an accurate description, remember, this is a vintage item and there may be small imperfections from age or flaws from production that we have not noticed or noted in the comments. We try to list all the deficiencies, marks etc.  Please review ALL pictures closely. All our items are as is, all photos are of the actual item that will be shipped.