A system for displaying a voltage wave wherein the wave and a delayed version of the wave are separately compared with a voltage ramp that is proportional to the position of an electron beam is changed between the point where the voltage ramp equals the voltage of the voltage wave and the point where the voltage ramp equals the voltage of the delayed version of the wave.

The vector generator comprises X and Y digital-to-analog converters providing X and Y deflection voltages to a cathode ray tube display. X and Y digital accumulators provide respective inputs to the X and Y digital-to-analog converters. The word lengths of the accumulators are wider than those of the digital-to-analog converters and the digital-to-analog converters derive their inputs from the most significant digits of the accumulators. X rate and Y rate signals proportional to the sine and cosine of the vector angle are applied as inputs to the respective accumulators which accumulate the rate signals with the present contents of the accumulators so as to generate linearly changing X and Y deflection signals. The vector angle is adjusted by changing the ratio of the sine to cosine inputs to the accumulators and the vector speed is controlled by increasing and decreasing the sine and cosine signals but maintaining the ratio therebetween the same. Preferably, the accumulator is implemented by an adder and latch combination providing the least significant portion of the accumulator with an up/down counter providing the most significant portion thereof.

An automatic line segment generator is disclosed primarily for use with linear array display devices. Converted analog data is received from a single slope analog to digital converter. This received digital data is synchronized with a system clock and is positioned and stored as line segment data during one measurement period of the analog to digital converter. New data is received during the next measurement period and is then synchronized, positioned and compared against the previously stored line segment data. The length of the line segment in storage will remain the same or increase based on the position and length of the newly received data, i.e. if the new data position is within the stored data position, the stored data remains the same and if the new data position is outside of the stored data position, the stored data length will increase to the new data position.

A separator for use in an electrolytic cell between the anode and a cation exchange membrane is provided to prevent the membrane from touching the anode, the separator having a central mesh portion that is hydrophilic and a surrounding peripheral frame portion.

Vector (i.e., line) drawings represent the "intelligence" content of images. A method is disclosed for the gathering of intelligence and the generation of vectors on the screen of a CRT without the usual problems associated with cost and performance. The Vector Generator itself uses pairs of digital-to-analog converters with a common analog output. This technique is referred to as interpolation. Careful shaping of the complementary reference voltages of the digital-to-analog converters results in constant velocity, transient-free vectors with starting and end points that are accurately controlled. Cumulative (i.e., closure) errors are entirely absent.