Beautiful Early-Mid 19th Century Handmade Double-sided Boxwood Scale Rule and Protractor writing tools gaseous features extending outward from

gaseous features extending outward from the Sun's surface in the photosphere

gouache I believe

Color lithography on a nice wight stock

I am fairly certain this piece dates from sometime between 1890s-1930

with light overall wear

Beautiful Early-Mid 19th Century Handmade Double-sided Boxwood Scale Rule and Protractor writing tools gaseous features extending outward fromIt 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