> PS: a sidenote - strange to see spelling mistakes like a “pain of glass” in an academic paper. Presumably transcription errors; that example appears as "pane

> PS: a sidenote - strange to see spelling mistakes like a “pain of glass” in an academic paper. Presumably transcription errors; that example appears as "pane of glass" in the original paper visible at <https://books.google.com/books?id=AQDtAAAAMAAJ&lpg=PP7&pg=PA306 https://books.google.com/books?id=AQDtAAAAMAAJ&lpg=PP7&pg=PA...>