Dashy Writing

My work notebook is quite organised (once I left it in a partner's office and she returned it to me, saying she guessed it was mine because of all the tables and numbered lists). But sometimes I retrospectively clutter the pages with doodles or recreational maths. Here is a page where I worked on a practical problem of geometrical optics.

 

Unfortunately, my handwriting in my work notebook tends to be slipshod. I suspect it is not quite at the stage where, as suggested in the early 20th century Lessons in Dashy Writing, it can be a promising ladder by which I rise in the world.