- Subject
- Mathematical instruments
- Item type
- Object
- Makers
- Langlois
- Provenance
- Presented by Lewis Evans.
- Primary inscriptions
- "Langlois AParis aux Galleries du Louvre"
- Physical material
- Brass
- Object type
- Alidade
- Dimensions
- Height: 153mm Width: 544mm Depth: 52mm Weight: 0.65kg
- Inventory No
- 42585
- Accession Number
- 1924-0/part
Description
The rule has a bevelled edge but no scales. Each sight has alternating pinhole and thread sights. One sight has two open threaded sections and three pinholes; the other has three threaded sections and four pinholes.
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