Beautiful Early-Mid 19th Century Handmade Double-sided Boxwood Scale Rule and Protractor spanish colonial santos Framed: 7 1/8" x 5"

Framed: 7 1/8" x 5"

Pencil and crayon I believe

with no missing bits or splits

) Really a charming set

Beautiful Early-Mid 19th Century Handmade Double-sided Boxwood Scale Rule and Protractor spanish colonial santos Framed: 7 1/8" x 5"It would take someone much more knowledgable than I to explain all that it rolled into this early mid 19th century protractor rule, but I've looked at and held enough to know that it is a special one, and an early one, and really a beauty. With diagonal scales at either end of one side, and a dense array of scales on the reverse, with "Cho" (Chords), "Rum", and "Lon" (for Longitude I believe) marked at either end. I believe the various scales featured