Journal of Research of the National Bureau of Standards
Abstract
An apparatus has been developed for making precise measurements of the absolute thermal expansion of refractory materials at temperatures up to 1600 �C. This apparatus consists of an optical comparator and a controlled gradient vacuum furnace. Special care was taken on the techniques of measuring length and temperature and on the calibration of the microscopes and thermometers. The expansion data obtained with this apparatus on specimens of platinum and sapphire have a standard deviation of less than 30 ppm and are estimated to be accurate to within 50 ppm.
Addeddate
2012-06-15 18:59:24
Cite
J. Res. Nat. Bur. Stand. Sec. C: Eng. Inst., Vol. 71C, No. 2, p. 85
Identifier
jresv71Cn2p85
Identifier-ark
ark:/13960/t4sj2mz7p
Issue
2
Ocr
ABBYY FineReader 8.0
Page
85
Ppi
600
Rights
The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the
