In 1927, we didn’t have global positioning systems or micro LCD displays. But we did have the Plus Four Wristlet Route Indicator. A map that fit on your wrist, a driver could turn the knobs to scroll up their route in a manner far more dignifying than the giant-map-fold-curse-refold manoeuvre… More at Gizmodo.
Love this. Such a ‘way ahead of its time’ idea.