Last week, I posted about the The Gustavademecum for the Island of Manhattan, a delightfully geeky, DIY-made, mid-20th century dining guide produced by a physical chemist for the benefit of traveling scientists and engineers.

One of the key features of the guide was an elaborate series of symbols and letters that provided a lot of information about various restaurants in a small amount of space—and which look like some kind of crazy alchemical shorthand. In the original post, I included a page from the guide, so you can look at that to see the symbols in action.

Hugh Merwin, who wrote the story on The Gustavademecum for Saveur, also scanned a page from the guide's key, which didn't appear in the original story. You can see some of it above, and visit his personal website to see the full key.