Abstract: A protective shield for protecting a sprinkler head is disclosed. The protective shield may have a body that defines an outer perimeter that engages the ground when installed. The outer body has a carved upper surface from the outer perimeter that proceeds upward until it reaches a ridge. This permits the lawnmower or other object to be lifted above and over the sprinkler head to protect the sprinkler head. The protective shield may be cut during installation to fit different sized sprinkler heads and also to fit adjacent to a straight pavement or a corner of the pavement. The shield also prevents overgrowth of grass that might prevent proper functioning of a pop op mechanism or sprinkler head water spray.

Abstract: A method for determining a relative clay content of at least a portion of a well core taken from a subterranean geologic formation by: determining the relationship of the clay content of the well core portion to the dielectric constant of the well core portion at a selected frequency at relatively few locations over a substantial length of the well core portion by measuring the clay content by a clay determination test such as x-ray diffraction, thin section analysis, sieve analysis or laser particle analysis and the dielectric constant at the locations; and, measuring the dielectric constant of the well core portion at a large plurality of spaced apart other locations on the well core portion at the selected frequency; translating the large plurality of dielectric measurements according to the relationship into relative clay content measurements. The dielectric constant is representative of the water constant of the well core portion, which is related to the clay content of the well core portion.