1. This was one of the earliest "pocket watch" slide rules. It was basically a French rule but was sold by number of other companies including Stanley of London
This rule is from the collection of C Barnes.
Front view
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| Make | Chatelain, France |
| Model | Calculigraph |
| Notes 1. This was one of the earliest "pocket watch" slide rules. It was basically a French rule but was sold by number of other companies including Stanley of London This rule is from the collection of C Barnes. |
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Front view |
Back View |
| Manufacturing date | c 1900 |
| Length | |
| Material | |
| Scales | |
| Cursor | None |
| Hair lines | None |