Process and apparatus to detect micro-organisms in a medium

Abstract From the Canadian patent

ABRIDCEMENT, Medical specimens suspected of containing certain microorganisms are introduced into cards containing wells having culture media therein. A reduction in the light transmitting characteristics of any well indicates the presence of a microorganism. Each well is examined at periodic intervals by projecting a light through it. This light is monitored by a plurality of detectors located beyond but nevertheless, in alignment with the well and each, detector provides a signal which is proportional to the intensity of the light cast upon it. If a detector registers an unduly large decrease in light transmission whereas, others associated with the same emitter do not this, probably …