A system for dividing a container into compartments has a divider that divides the container into compartments. The device also includes a plurality of electrodes disposed along the longitudinal surface of the lead near the distal end of the lead. Secondary players may participate in games from the past. According to a method of measuring an environmental parameter, the optical fiber-based sensor is positioned within a high-temperature environment having a parameter desired for measurement. The device uses a pawl and rack to affect a ratchet-like motion, the direction of which permits travel in the opposite direction only after the limit of travel is reached. The single crystal production apparatus and single crystal production method can reliably prevent melt from reaching a metal portion below the pedestal even when the raw material melt in the crucible flows to the outside of the crucible in an unexpected accident or the like and runs down along the pedestal and thereby prevent damage to the apparatus and the occurrence of an accident.