David,

Some more information on your Photo.

The machine in the background is a Massy-Ferguson Steam Tractor circa 1909-1917. Not sure of the model because I can't see the control platform but when fitted with the smooth wheels you see in the photo would have been used to grade roads to the well site(That may be the thing you see attached underneath between the two men)/act as a pony engine to lift pipe and drive the rig. There would be a large flywheel looking thing on the left side which drove a long belt which would be led to a winch or the drill head gearbox/and in a pinch the fire box could be used as a forge. The portable forges of the day however would have looked more like a backyard barbecue with a hand cranked bellows fan attached.

A great photo. I know why you treasure it.

Thank you for sharing.