Umm. Russel came up with 1914 because someone measured how many inches some passages were in the pyramids. Then the numbers didn’t work so he said the inches were wrong so they made up pyramid inches as a measure. There were still enough suckers around to believe this bullshit.
Rutherford/franz noor got into the 607 bullshit so that the times time and half a time would work out to the 1914 date. People still believed in it. I believed in it.