windscreen wiper delay circuits and how to install them

When driving in a very light rain one finds that the wipers have to be continually switched on and off to remove the small quantity of water on the windscreen. This is usually accomplished in one or two sweeps and then the wiper blades proceed to grate and screech, obviously not good for the wiper blades or the windscreen itself. The obvious answer is to find some way to automatically switch on the wipers every once in a while. This article describes two good `delay` circuits and the way to connect them into a car