drum meter

drum meter

[′drəm ‚mēd·ər]
(engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The history of positive displacement gas flowmeters goes back to 1815, when Samuel Clegg invented a water sealed rotating drum meter. This model was improved in 1825 but problems remained with high cost, freezing, and large size.