Portable unitary battery powered hand-held magnifying apparatus

摘要

A portable unitary battery powered hand-held magnifying apparatus which is especially useful for examining gems includes a tubular battery casing with a penlight bulb mounted at its end to provide the necessary dark field illumination for showing inclusions in a gem. A ten power triplet type magnifying lens is hingedly mounted to the end of the tube for convenient carrying but when moved 90 DEG its lens' axis is then perpendicular to the nominal light axis. The light bulb is in a parabolic reflector to provide substantially parallel rays. The focal distance of the lens is at the light axis where a gem would be placed for examination.