such as Compton had observed.
A few weeks before the date of this writing, at the Norman Bridge Laboratory of Physics at Pasadena, Becker, Watson, and Smythe,[193] using aluminum as a scatterer, obtained a Compton-effect photograph which showed both components of the
-rays of molybdenum displaced by an amount which could be measured with an accuracy of about 1 per cent (as checked by the author) and within this limit the agreement with the displacement computed by the foregoing Compton equation was exact. In this case the Duane-effect-line is completely removed from the Compton-effect-position, and it too was found upon the photographic plate. This furnishes, I think, unambiguous evidence for the reality of the Compton effect. Ross also informs me that he has obtained the Compton shifted line from a number of other elements besides carbon—elements in which the Duane effect could not possibly be confused with it.
The accompanying plate sinews in [Fig. 36] one of the Becker, Watson, and Smythe recent photographs. This one was not taken with sufficient resolution to show the
-line as a doublet, but is more reproducible than the one that did. The direct images of both the
- and
