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Device for counting and calculating

  • US 4,054,782 A
  • Filed: 10/13/1976
  • Issued: 10/18/1977
  • Est. Priority Date: 12/10/1973
  • Status: Expired due to Term
First Claim
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1. A stereological counting and computing device comprising, in combination:

  • -an optical system for forming an image of a specimen;

    means for causing a test system to be seen in the plane of the image of the specimen;

    at least two manually operable counters for separately recording numerical data obtained from a visual analysis of the image of the specimen using the test system;

    a computing unit;

    means for determining which one of a plurality of test systems is in use and for supplying to the computing unit data relating to the test system whereby the computing unit is programmed to calculate numerical values of at least two parameters of the specimen from the data recorded in the counters together with the mean and relative standard deviation of the calculated values; and

    at least one display device for each of the mean and relative standard deviation whereby an estimate of the accuracy of the calculated values can be made after each entry of data from the counters.

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