Abstract
A new calibration of the improved version of a photo-electric nucleus counter with a fog-tube of 3.85 cm air-column diameter and blotting-paper lining and of a photo-electric counter Model 1957 with air-column diameter of 2.5 cm and ceramic lining was carried out by adjusting the calibration curve of 1946 with reference to the considerably improved absolute (Aitken type) counter with stereophotomicrographic recording.
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