------=_NextPart_000_0009_01C54054.C3C7AA00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm not sure of the sources, but the weight difference between Belmont and = Thornborough might just be due to discrepancies in the measurement of the d= iameters It's highly unusual for two inspectors to agree a bell diameter within 1/8,= and discrepancies can be as much as several inches. If ever the NBR gets o= ff the ground, diameters - not weights - will be the most difficult data el= ement to establish (or arbitrate between submissions) with any degree of re= liability CP ------=_NextPart_000_0009_01C54054.C3C7AA00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I'm not sure of the sources, but the weigh= t=20 difference between Belmont and Thornborough might just be due to discrepanc= ies=20 in the measurement of the diameters

It's highly unusual for two inspectors to = agree a=20 bell diameter within 1/8, and discrepancies can be as much as several inche= s. If=20 ever the NBR gets off the ground, diameters - not weights - will be the mos= t=20 difficult data element to establish (or arbitrate between submissions)= with=20 any degree of reliability

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