The Small Particle Analyzer (SPA) with a range of 0.1 to 21 microns was developed. The SPA employed a patented method of differential polarization of several light wavelengths to measure particles.
Later that same year a large particle analyzer was introduced with a measurement range of 22 to 1200 microns using a linear electronic array.
In business news, Leeds & Northrup was aquired by General Signal resulting in the establishment of a full-time dedicated sales force for the Microtrac product line.
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