Interference Methods for Standardizing and Testing Precision Gage Blocks (Classic Reprint) - Tapa blanda

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Excerpt from Interference Methods for Standardizing and Testing Precision Gage Blocks

Numerous comparisons made by spectroscopists between these fundamental wave lengths and the wave lengths emitted by other luminous substances prove that the light waves are the most dependable length units known. Their work has placed at our disposal a large number of light sources which can be easily obtained and operated and which emit radiations whose wave lengths are known to one part in four or five million. The only remaining requirement is the easy application of these waves in the calibration of end standards.

In making this application incandescent neon and helium gases, giving wave lengths ranging from to micron to inch) were used.' These have been determined6 with an accuracy of one part in four or five million and found to be exactly reproducible within the limits of observational error. For an accu racy of one millionth of an inch a comparison with these waves is therefore exactly equivalent to a comparison with the standard meter.

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