1. Field of the Invention
This invention pertains to casting tools and the techniques for forming an exact replica of an eroded area in an underground gasoline storage tank and repair of the eroded area.
2. Description of Prior Art
A wide variety of approaches have been attempted to investigate this erosion problem. One of the approaches has been sonic graphing of eroded areas, inspection by closed circuit TV cameras. Dentists employ related techniques in producing mouth impressions of damaged or missing teeth. A known, related method for determining wear or erosion in the mechanical fields pertains to the determination of defects in a spur gear employing a casting procedure, such as U.S. Patent to Sawyer, No. 2,601,703, entitled "Method for Testing Surface Defects."