The resonant cavity is a circular cylinder, 1 meter long and 0.5 meter diameter, made from copper-plated stainless steel and containing up to 2 moveable tuning rods. The electric field within the cavity is sampled by an electric field probe connected to the ultra-low-noise receiver electronics. We search for axions by slowly scanning the cavity resonant frequency across a frequency range by adjusting tuning rods. Metal tuning rods increase the cavity resonant frequency as they are translated nearer to the cavity center; conversely, dielectric tuning rods translated towards the cavity center decrease the cavity resonant frequency.