Abstract

A manually operated point counter for thin section analysis is described. The machine is sturdy, inexpensive, and easily operated. Its precision has been tested by analyzing 47 thin sections in duplicate and computing the analytical error, or standard deviation of a single analysis, from the observed variance of the differences. The error distribution is effectively binomial and the precision of the instrument is somewhat better than that of the Wentworth-Hunt and Hurlbut integrators. Average operating speed is about four times that of the Wentworth-Hunt and twice that of the Hurlbut machine.

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