The Chapman flask has a wide base and two bulbs for determining the percentage of voids and surface moisture in fine aggregate. Graduated at 200mL between the bulbs, and from 375mL to 450mL in 1mL divisions in the neck. Used in ASTM C 70, AASHTO T-142, ANS A37.21, and CRD-C111.
Reference No. ASTM C 70