This cable-tool drilling rig was one of many used by the Gulf Oil Corporation in the early Borger oil field and is one of the few remaining rigs of its type. Although the sign on the front identifies it as Gulf Dial # 51, that referred only to the last well it drilled. The rig drilled eight wells on the Gulf Dial oil lease north of the Canadian River in Hutchinson County. Most early Borger field rigs were wooden and built on-site, but steel rigs began to appear by the late 1920s because they could be assembled, disassembled, transported, and used to drill many wells more cost-effectively. Unlike modern rotary rigs, cable-tool rigs pounded a hole in the ground: a boiler fired by wood, natural gas, or other available fuel produced steam to run an engine, which worked a walking beam that repeatedly lifted and dropped heavy drill bits attached to a cable. Drillers periodically raised the bit to clear the well bore, then lowered a bailer into the water-filled bottom so a valve could trap cuttings and rock debris for removal, while drill bits were reheated in a forge, sharpened, and reused until worn out. In this field, finding oil often required two to three months of continuous drilling, and as many as four wells in five were dry holes, though one successful well could make a wildcatter wealthy. The rig was moved to a site adjacent to the Aluminum Dome in Borger in the early 1960's, and in 1984 it was disassembled, transported, and reassembled at the Hutchinson County Historical Museum as a permanent outdoor exhibit. In 1984, Petroleum Hall was also built to house heavy machine tools and vehicles too large for the museum's main building, funded by the wife and children of Borger oil field pioneer "Benny" Benjamin, whose Central Supply Company had served the oil fields as an industrial supplier.