To prevent movement of a ceramic core in a ceramic shell for the investment casting of a turbine blade, the free end of the core has one or more pins embedded therein so that the pins project into both the core and the ceramic shell which is applied over a wax layer. When an effective torque calculated by an effective torque detecting section is decided by an effective torque deciding section as having exceeded a specified upper-limit value, the rotational speed of a drive unit is decelerated. The apparatus of the present invention may be used alone or in conjunction with other analyzers to produce mass spectra from analyte ions. In a preferred aspect, the chock assemblies include spaced apart first and second frame members that are adjustable with respect to one another, thereby providing an adjustable substantially parallel distance therebetween. The system then moves the set of interacting geometrical features from the sibling nodes to the parent node, so that the interaction is visible at the parent node. A negative active material-free portion is formed on a third end of the negative electrode.