The reverification of a four-metre rule

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Journal titleCanadian Journal of Research
IssueAugust 2
Pages137145; # of pages: 9
AbstractAn investigation is described in which a determination was made of the length equation of a four-metre invar rule used as a basis for measuring tapes. A short description of the rule and its associated apparatus is given. The investigation demonstrated that different rules made at the same time from the same ingot of invar do not necessarily have identical thermal coefficients. It was also found that the temperatures of two rules of different cross section differed considerably even in a room where the air temperature was changing only at a very slow rate i.e., 1 °C. in two or three hours.
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AffiliationNRC Institute for National Measurement Standards
Peer reviewedNo
NRC number3137
NPARC number8899511
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Record identifier629a02e2-0113-425e-bf22-0ad18b7994da
Record created2009-04-22
Record modified2016-05-09
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