When the front of the case was closed (thought it’s shown open here), there were six windows. You paid your shilling, the National Anthem started playing, and the machine got to work. Clark had pre-encoded words on turning cylinders, whose projecting pins would cause letters to drop, forming Latin verses. The cylinders turned randomly, so that a different verse was formed each time, but each verse had the same grammatical shape: adjective, noun, adverb, verb, noun, adjective:
PESSIMA REGNA DOMI PRODUCUNT VULNERA MIRA.
The worst kingships at home lead to astonishing wounds.
The number of possible permutations the Eureka can run through is 26 million. Clark also invented a waterproof fabric, but most unfortunately for him, he sold the patent to a Mr. Mackintosh.