This sprinkler head may look like a typical lawn-watering device, but it really isn’t: It’s actually a key holder that will help you hide your house keys in plain view of all potential trespassers.
Back in 1931 Modern Mechanix magazine ran an article about an invention used by German firefighters to protect themselves from being engulfed in flames. The simple device consisted of a helmet with a built-in sprinkler system that connects with a nozzle on the hose. Using a hand lever, the firefighter could control the amount of spray needed for a given situation. Clever—but it seems that fighting a fire in something that looks like an old-timey deep sea diving helmet might prove problematic. [Modern Mechanix via Boing Boing]
