Abstract: A tote bag includes a semi-rigid sack wall dependently and upwardly disposed about a rigid base to present an upwardly oriented mouth. The semi-rigid sack wall is affixed at the lower edges thereof to the separately constructed rigid base, which generally includes an outer perimetrical frame and an inner perimetrical frame, the outer perimetrical frame and the inner perimetrical frame cooperating to dependently support an interiorly disposed, wire mesh and to anchor the lower edges of the semi-rigid sack walls. A removable panel is included to selectively close the bottom of the tote bag.

Abstract: In a bipolar mark-space analogue-to-digital converter, two opposed-polarity reference voltages are applied to an integrator during a first conversion interval to balance a square-wave forcing-function signal and an input signal whose magnitude is to be measured, and a counter receives clock pulses at up and down inputs during application of the positive and negative reference voltages respectively. Subsequently, zero input signal is applied during a second conversion interval, and the inputs to the counter are interchanged, so that up- and down-counted pulses correspond to the negative and positive reference voltages respectively. At the end of the second conversion interval, the counter contains a digital representation of the input signal, corrected for zero drift.