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Charles

I was intrigued and had to look this up. It's US Patent 5408 dated 1871. On Google Books you can search for "Key to Baillairgé's stereometrical Tableau" and find his 1876 book explaining the entire system. It seems to be a reference for finding surface areas and volumes for irregular solid shapes. It is definitely a very eccentric approach to solid geometry, but upon casual examination, it seems to be perfectly valid.

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