A spark plug for an engine comprises a mounting member to be mounted to an engine, an insulator disposed inside the mounting member and formed with an axial hole, a center electrode formed of a metal material and disposed in the axial hole of the insulator in a manner insulated from the mounting member, and an earth electrode disposed so as to oppose to the center electrode. The present invention provides a vitamin D derivative of Formula :wherein X represents an oxygen atom or a sulfur atom;m represents a number of 1 to 3;R1 and R2 each represent a hydrogen atom or an alkyl group;R4 and R5 each represent a hydrogen atom or a hydroxyl group, etc. The multiple phase windings have active lengths and end turns, with the active lengths being located on one side of the form and the end turns located on the opposite side of the form. Thus, the wires from the integrated circuit to the top side directly contact the vias at their capture pads. According to the method of the invention, the above-mentioned company takes care of the administration of the telecommunication connections, including the acquisition and opening of the aforesaid telecommunication connections as well as the invoicing concerning them. In a method for controlling the screening machine, the amount of material on the screen surface is determined by automatic measurement, and the speed of the feeding means is controlled on the basis of the measurement by automatic control.