Long before satellites were transmitting data to GPS receivers to help motorists traverse the urban maelstrom, there was one ingenious device that did the rounds in London way back in the terrific 20s, 1927 to be spot on. Take a look at the Plus Four Wristlet Route Indicator that brought maps onto users’ wrists. This contraption basically uses rolled up paper maps which show the route of a particular place. To see the route, the driver just needs to pull off the road and then turn two knobs that sit on the ends of the Wristlet. The two knobs turn the rollers which move the paper maps fore and aft. Very simple, very effective. This Wristlet can store up to twenty maps making it a pretty comprehensive navigation tool. This unusual yet amazing contraption could also be used to keep golf scores. What is really stunning is the fact that all this has been made in the 1920’s and to catch the Plus Four Wristlet Route Indicator, you can head to National Trust House where it is on display till the 1st of June.
Via: DailyMail
