It is certainly better off in this perpetual trap that an albino rat signals to your attention, which never tires of falling into it. This stuffed rat alone represents, as in a Circus parade, the whole army of rodents that must fall into the same trap. The trap is in fact said to be perpetual because it is always set, the animal that gets caught in it training it by the very fact of its capture. This little device was recently presented to the Société d'encouragement and it was said that its manufacture employs 40 workers and a 6 horsepower steam engine. Whoever wants to make a fortune by invention is often more likely to do so by means of an ordinary trinket than by one of those ambitious machines which tend to revolutionise a whole branch of work.
©L'Exposition Universelle de 1867 Illustrée