A comparative study of the operation and efficiency of machine “A”, a leading centrifugal juicer; machine “B”, described as being a juicer, grater and homogeniser; and machine “N”, a Norwalk hydraulic press juicer. A chemical analysis of the mineral content of the extracted juices was made. Uniform 5-pound samples of carrots, parsley and celery were run on each of the machines with the following results:
This study indicates that the Norwalk produces a much greater amount of juice from a given sample than does either of the other juicers in much less time. The extremely fine pulp produced by the Norwalk and the very great pressure applied by the hydraulic press would appear to account for the greater yield of juice and the very marked superiority in the extraction of mineral content.