Color photo of Tom Yetter and Emily Abbink looking for evidence of filled-in outhouse pits.

The author describes the two electronic devices and how they extract information from underground, These devices allow to map buried foundations, trash hoes and outhouse pits.This survey is part of a project to restore the oldest house in Santa Cruz (160 years old): known as the Santa Cruz Mission Historic Adobe. The house (builtin in the 1820s) was originally a row of 17 identical one-room apartments but it suffered many changes in its existence. It is reported that the house was continuously occupied until 1983. The author also reports that these devices have been used in other archeological sites such as in the Great Pyramid in Egypt.