Aston & Mander Scott's Patent Rule

Note
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Front

Back


Front Left
Front Right

Back Center

Edge view, showing how two slides are linked together

Note

This rule is marked as ASTON & MANDER Scott's Patent Slide Rule. It is desined to calculate the weight of any material. It can be either a sheet or a rod form. With the second slide, it can handle variety of materials ranging from as light as cork to as heavy as lead.
The back of the rule carries an ad for a dry dock. Could this rule have been a give-away for their customers?
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