The material presented in this appendix is based on “Factors Influencing  Ratio for Straight Pipe Flow Straighteners Associated With Turbine Flow meters” by M. H. November, Engineering Report No. 65, Potter Aeronautical Corporation, (Union, New Jersey), January 4, 1967. Revision A to the report is dated February 16, 1967, and Revision B is dated February 26, 1967. According to the copies of the correspondence with Mr. November that are now on file with the API Measurement Coordination Department, many individuals, as well as a committee, reviewed this method. The material was published in API Standard 2534 (now out of print) and subsequently in API MPMS Chapter 5.3.

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