This 1890s study presents a practical method to determine the coefficient of expansion of metals between the freezing and boiling points of water, expressed in terms of a light wavelength with known refrangibility. It shows how a refractometer can be built and refined to make precise length comparisons at high and low temperatures.

The authors describe developing a robust apparatus, including large brass boxes and a refractometer, to keep the experiment free from air and moisture effects. They recount the progression from initial attempts to a fully tested setup, the challenges of obtaining clear fringe measurements, and the eventual demonstration of the method’s feasibility through careful trials and improvements.

Introduction of a new interferential approach to measure metal expansion tied to light wavelength.
Detailed account of constructing and refining a vacuum-compatible refractometer and supporting hardware.
Practical experience from observing expansion in steel and bronze bars, with long-duration testing.
Discussion of experimental challenges and the reliability of the method for precise measurements.

Ideal for readers interested in the history of precision experiments and the development of interferometric techniques.

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