A pumping circuit includes: a pumping capacitance; a first drive transistor connected between an input node for receiving an input voltage and one terminal of the pumping capacitance; and a second drive transistor connected between an output node for outputting an output voltage and the one terminal of the pumping capacitance. The apparatus may further include a second set of polylines associated with a second channel length and aligned with the first set of polylines, where each polyline within the second set of polylines is laterally separated by the substantially constant pitch. The conductive plate receives a fastener for securing a substantially straight wire to the conductive plate. The thermal control plate may have a port for passing working gas from one side of the thermal control plate to the other. The lower housing is connected to a bearing pack supporting a drill bit such that upon changing the angle and azimuth of the lower housing, the direction of the drilling of the drill bit is also changed. The method and apparatus control the thickness of the stretched film and impart desirable mechanical properties thereto such as film products with a high modulus for handling and suitable tensile for softness.