SUMMARY An olfactometer described previously was modified and used to determine odor‐difference thresholds for 48 subjects at 4 levels of 2‐heptanone. The apparatus was found to give rapid and reproducible threshold measurements. Difference thresholds were found to follow the Weber law. A Weber fraction of 0.23 mg/min/deviate was determined for 2‐heptanone. The absolute threshold was found to be 8.97 × 10 −4 mg of 2‐heptanone/L air.
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Stone et al. (1962) studied this question.
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