Thi s pape r desc ribes a s imple device wh ich perm it s mass compari sons in air wit hout appea l to the correct ion for ai r buoya ncy. The device consi sts of a ca nis te r whic h is evacuated and weighed on a laboratory ba la nce with a mass inside. A second we ighing of ano ther mass in the evacuated cani ster provides th e des ired mass com parison .
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Koch et al. (1978) studied this question.
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