/sci/ - Science & Math

The handwriting is interesting. It is not coherent with any handwriting from the early 20th century and the way the arrow was written suggests a writer skilled in writing with broad feathers, also unusual for the 20th century.

On the other hand someone who wrote in 1932 would not necessarily have a 20th century handwriting. The picture in this post is a very typical European form of handwriting from the mid 19th century.

The rate of lignin reactions in this paper as well as the perfect surface point to an age older than 1940 and younger than ca.1750.

So from this it is possible that 1932 was the date of origin.