Currently in Brussels, there is an exhibit of Leondardo da Vinci’s inventions and ideas with plenty of models and replicas on display. The steampunk website The Gatehouse reviews it from a steampunk/clockpunk perspective. Link >>>
Reviewer Hilde Heyvaert has also placed a great set of exhibit photos on Flickr. Link >>>
Fifteen years ago, when I wrote the renaissance fantasy game Gondica, devices like this served as the major source of inspiration for the setting’s “weird” technology.