- 42 - 3. Description of the torsion scale and the measuring arrangement A torsion scale with bifilar suspension was used (in order to eliminate the physical influence of suspension wires) (images 2 and 3). The materials of the torsion scale, as well as all other used parts, are non-ferromagnetic or paramagnetic, and mainly consist of aluminium and brass. The suspension is made from 0.3 mm stainless steel wires. The whole torsion scale is in an enclosure in order to exclude the effect of external air currents. It had been proven that electrostatic influences, magnetic influences as well as air currents have no interfering effect that could reach the magnitude of the expected effect under corresponding test arrangements. This could be verified through a long series of comprehensive tests. The deflection of the torsion scale was registered via a lighting device, rotating mirror and recorder. The recorder utilised a photocell array that helped to guide the ray of light. The path of the light was 7 m. The sensitivity of the torsion scale in regards to the recorder at a distance of 7 m is 25 dyn cm/cm. The torsion scale is aperiodically dampened with oil and damper wings. The undampened natural vibration time is 120 s. Image 2: P = Probe, G = Weight, S = Rotating mirror, D = Oil dampener, L = articulated suspension, B = Recorder (in follow-up circuitry mode), s = path of light (7m), A = Light source. The coupling of high frequency happened capacitively via air condensers attached to the probe on the torsion scale (They were also inductively coupled in individual experiments). The high frequency HF currents were effective up to around 10 Volts. The output was in the region of 20 micro-watt to a few 100 milli-watt. A push-pull oscillator was used to produce the high frequency, one that could equip a push-pull power amplifier. But the power amplifier was generally not used, only the part of the high frequency that reached the test arrangement from the oscillator to the grid anode capacity of the power amplifier (Current damping factor of around 100 to 200). The full output of the push-pull amplifier under full control is around 20 to 50 Watt. Even utilising the
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