To download click on the picture to get a full size image. Right click and "save to" your computer desktop or a folder of your choice.
I am working on something Steampunk right now so I have been searching for those kinds of images for myself. I recently stumbled upon the U.S. Patent office site and have been randomly typing in patent numbers to see what I get. These were results from another search where I found a cool site called the Patent Room.