Abstract: A continuous dust accumulation monitoring system, device and method monitors and measures dust accumulation via an enclosure and a machine vision subsystem which can include a digital camera. A dirty optics detection subsystem monitors optical clarity and can invoke a cleaning assembly to help maintain clarity of optics for monitoring and measuring dust accumulation.

Abstract: Cylindrical, interconnected stacked vertical sleeves provide a vertical pit (or shaft shoring system) for use in subterranean construction projects. Large-diameter, interlocking fiberglass, plastic, or polymeric sleeves have an interlocking portion at the top and a second interlocking portion at the bottom, which allow sleeves to be safely and securely seated upon each other to build the vertical pit up to 20 feet deep. Lifting rings on the interior wall of the cylinders allow lifting, placement, and removal by a crane or other piece of heavy lifting equipment.

Abstract: A reversible toe pad used by dancers comprising a pad material and a bonded seamless fabric material. A fabric is bonded to the surface of a padding material on one side so as to form a reversible toe pad. The toe pad may be reversed so that the padding material is placed adjacent the dancer's toes or the fabric material is placed adjacent the dancer's toes, depending upon the dancer's preference. The padding material may be a gel or foam. A molding process utilizing a female mold and a male mold may be used.