Abstract: Polymeric matrices such as poly(vinylchloride) and poly(methylmethacrylate) loaded with mixtures of an organopolyselenide characterized by the formula:R.sub.1 -- (Se).sub.n -- R.sub.2and an organomercury compound characterized by the formula:R.sub.3 --Hg--R.sub.4form the basis for high resolution and contrast microimaging film systems. Irradiation of these films with activating radiation results in dark images in light struck areas and colorless background. The microimaging film is a negative working system with add-on reimaging capability. The images are stable to projection in conventional slide projection systems.

Abstract: A measurement averaging counting apparatus employing a randomly phase modulated time base provides resolution improvement when measuring an applied signal comprising time intervals or pulsed frequencies repetitively occurring at rates synchronous to a counter's clock frequency.The phase of a reference frequency is varied in response to a random signal. The phase modulated reference frequency is applied to a frequency multiplier chain which multiplies both the frequency and the effective amount of phase modulation. The randomly phase shifting output of the frequency multiplier chain is applied as a clock signal to a measurement averaging counter thereby destroying coherence between the clock signal and the applied signal and allowing statistical averaging to take place.