
These ingenious contraptions can water a large area by motoring along the length of your hose over a few hours, saving you from having to move your sprinkler multiple times. A good article explaining how these tractors work is found here: http://home.howstuffworks.com/traveling-sprinkler1.htm
The yellow one is the Nelson Travelling Tractor Sprinkler, as advertised on Amazon (http://www.amazon.com/Sprinkler-Nelson-Traveling-Tractor/dp/B0001LF7LU). Several people wrote reviews, saying that this particular model has problematic plastic gears that were stripped when the tractor got hung-up on something, or that other parts

The green tractor is the John Deere model. It seems to have the most visual appeal, in my opinion. I hate to say it about a tractor, but "isn't it cute?". Well, perhaps you can guess why my purchase of a new piece of machinery was vetoed by resident-lawnmower-man. I promised to do more research into this before purchasing anything...or wait a minute...did he realize mother's day is coming up soon? Someone send him an email!!!

Does anyone out there have one of these? Send a comment my way -- it's easy to put comments on my blog. You don't need to give your email address and you can even be anonymous.