Here are a few quotes by Hayden Covington during a court case in Scotland in 1954,
There is every reason for a change in interpretation as we view it, of the Bible. Our view becomes more clear as we see the prophesy fulfilled by time.
we have always striven to see that we have the truth before we utter it. We go on the very best information we have but we cannot wait until we get perfect, because if we wait until we get perfect we would never be able to speak.
Unity at all costs, because we believe and are sure that Jehovah God is using our organisation, the governing body of our organisation to direct it, even though mistakes are made from time to time.
It makes one wonder who they were attributing the mistakes to here - the watchtower or jehovah?
Fred Franz, on the wts authority in interpreting the bible
They submit the Bible or the statements that are therein made, and the individual examines the statement and then the Scripture to see that the statement is Scripturally supported.
The full article is here
http://www.quotes-watchtower.co.uk/false_prophecy_admitted.html
And the watchtower admitted to false prophecy during this trial, something they never do nowadays. I hope it helps
dedpoet