Exceptional Earlyish 19th Century Trigonometry Notebook with Watercolor IllustrationsI've bought and sold a good handful of 19th century maths and penmanship notebooks now, and this I think is the most beautiful of the former that I've had in my possession, incorporating wonderful little ink and watercolor drawings of houses and rivers and lighthouses into diagrams applying plane trigonometry. The notebook appears to be partial, with a few pages at the end (or beginning) facing in the opposite direction, but what is here is for the