Maybe you first saw one of them in a video game or a heavy metal album cover: the 69 demons Louis Le Breton illustrated for Collin de Plancy's Dictionnaire Infernal (previously). But who was the man who rendered these images, and brought the dukes and presidents of Hell to life in such specific detail? Would he want to be remembered for his drawings of composite monsters and naked men riding dragons, or did he perhaps leave another legacy entirely? [more inside]
The National Maritime Museum, Greenwich has some excellent online collections related to maritime history and technology, including telescopes, marine chronometers, sundials, and a whole lot more. Some stuff I've been looking at: John Harrison's chronometers (described in Dava Sobel's book Longitude), polyhedral sundials, and pocket globes.
Astrolabes revisited: previously discussed here. Are astrolabes a way to navigate life? Want a free personal birth chart? How about an astrological weather forecast?
The Astrolabe: an instrument with a past and a future. You can even download your own Electric Astrolabe. (via finches' wings)