Finndog, "drilling rig" is a relatively modern term in the oil and gas industry that came in use with the rotary table and drill pipe. The rig your grandfather worked on was called a "cable tool" rig. The cable tool bit was more like a chisel that was repeatedly raised and dropped on the rock face at the bottom of the hole and chipped the rock away. The cuttings were removed with a bailer. All of these "tools" were operated by a cable running to the surface, hence the name cable tool. The cable tool technology predates the oil and gas industry by hundreds, if not thousands, of years as they were used to dig water wells. I've seen water wells dug with a cable tool rig as recent as the 1970's. There may still be some operating.
Ain't it fun how these threads get off topic?