Abstract: An apparatus for depicting contour lines on the surfaces of a model, the apparatus comprising a bed for supporting the model, and at least one laser for projecting a plane of light at a predetermine height from the bed. A method of depicting contour lines on surfaces of a model, the method comprising projecting a plurality of planes of light in spaced relation over the surface of a support to illuminate contour lines on objects on the surface that break the planes of light.

Abstract: An apparatus for depicting contour lines on the surfaces of a model, the apparatus comprising a bed for supporting the model, and at least one laser for projecting a plane of light at a predetermine height from the bed. A method of depicting contour lines on surfaces of a model, the method comprising projecting a plurality of planes of light in spaced relation over the surface of a support to illuminate contour lines on objects on the surface that break the planes of light.

Abstract: A guide adapted to be installed on a diptube to faciliate locating and inserting and removing a dipstick from the diptube comprises a compressible stem section adapted to be secured over proximal end portion of a diptube, and a cup section adjacent the stem section which surrounds the proximal end of the diptube when the stem is secured thereon. The guide preferably has a longitudinal slot in the stem and cup, allowing the guide to be friction fit on the proximal end portion of the diptube or compressed around the proximal end portion of a dip tube. The guide is secured with a clamp that compresses the stem around the diptube, or the guide may have an integral clamp that compresses the stem around the diptube. The guide is preferably made from a molded, brightly colored plastic.