English: Mid-19th century tool for converting between different standards of the inch - in the Museum of the History of Science, Oxford

Scales shown:

• Hamburgh - Inch divided into 8 parts. 1 inch ≈ 23.2 mm
• Austrian - Inch divided into 8 parts. 1 inch ≈ 25.8 mm
• Itallian - Inch divided into 8 parts. 1 inch ≈ 28.3 mm
• Bremen - Inch divided into 10 parts. 1 inch ≈ 23.7 mm
• Swedish - Inch divided into 12 parts. 1 inch ≈ 24.3 mm
• Turkish - Inch divided into 12 parts. 1 inch ≈ 31.3 mm
• Bavarian - Inch divided into 12 parts. 1 inch ≈ 24.0 mm
• Spanish - Inch divided into 12 parts. 1 inch ≈ 23.0 mm
• Portuguese - Inch divided into 12 parts. 1 inch ≈ 27.0 mm
• Moscow - Inch divided into 12 parts. 1 inch ≈ 27.7 mm
• Russian - Vershok divided into 8 parts. 1 vershok ≈ 44.1 mm
• Amsterdam - Inch divided into 12 parts. 1 inch ≈ 23.5 mm
• Rhynland - Inch divided into 12 parts. 1 inch ≈ 26.1 mm
• French - Inch divided into 12 parts. 1 inch ≈ 27.0 mm
• Fr. Metre - Centimetres divided into Millimetres.
• English - Inch divided into 32 parts. 1 inch ≈ 25.3 mm