A hydraulic fluid tank for a drilling machine includes a primary chamber and a secondary chamber. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i. A plurality of connection wires connect electrically the bonding pads of the chip to the first surface of the leads respectively. The power dissipated in the remaining resonator heaters is set according to a predetermined function having as an input variable the power dissipated in the resonant heater under control of the said feedback loop. A cumulative thickness of the waveguiding layers is less than one tenth of a free space wavelength of the incident radiation at the peak reflection frequency divided by an average refractive index of the waveguiding layers. This expedient leads to the formation of high quality images, especially when scanning photothermographic elements in which the silver halide, metallic silver, andor any organic silver salts have not been removed.