I was just reading the old document by H.A. Lorentz " The Einstein Theory of Relativity" which is freely available in ebook and text format. I find it interesting to read some of the comments from those times, and Lorentz provides a nice summary of the thoughts of the days soon after a second prediction of GR was confirmed (May 29, 1919); namely the Eddingtion comfirmation of the GR predicted bending of light near a star. Previous to this, it seems that the explanation of the perhelion of Mercury was the only experimental evidence for GR. My question relates to a comment that is made about the failure of GR with regards to gravitational redshift. At the time of this article, there had been no spectroscopic evidence for gravitational redshift. This in itself does not surprise me since it was another 10 years before Hubble discovered the expansion of the universe. However, what surprises me is that the comment seems to indicate that the spectroscopic experts of the time felt that the experimental evidence actually contradicted GR. Can anyone provide a historical context for this? Did the experimentalists actually have data sufficient to hold this opinion? Apparently, they didn't catch the redshift from the expanding galaxies, but maybe they were only looking locally. However, what made them think that they had the data which was not consistent with GR? Obviously, GR has withstood the test of time on a cosmological scale, but I'd like to understand the history and technical details behind this, if possible. Did the experimentalists have bad data, bad interpretations or were they just blowing smoke? Can anyone shed some historical light on this? For reference, I provide the a quote of the relavent paragraph, but the entire article is readily available if you search " Lorentz The Einstein Theory of Relativity". It's only a few pages long. "(3) In the excitement of this sensational verification, there has been a tendency to overlook the third experimental test to which Einstein's theory was to be subjected. If his theory is correct as it stands, there ought, in a gravitational field, to be a displacement of the lines of the spectrum towards the red. No such effect has been discovered. Spectroscopists maintain that, so far as can be seen at present, there is no way of accounting for this failure if Einstein's theory in its present form is assumed. They admit that some compensating cause may be discovered to explain the discrepancy, but they think it far more probable that Einstein's theory requires some essential modification. Meanwhile, a certain suspense of judgment is called for. The new law has been so amazingly successful in two of the three tests that there must be some thing valid about it, even if it is not exactly right as yet."