In my research on 'The Lord's Arrival",I found that William Miller predicted Jesus would return in the fall of 1843.When that didn't happen he said it would be in the spring of 1844.When that didn't happen he moved it to the fall of 1844.By then he had so few followers it wasn't worth setting a new date.
Some 30 years later Nelson Barbour decided that William Miller was right about Jesus's return,he just got the date wrong.Barbour figured it would be in 1874.He was so sure of it he even convinced his buddy Charles Russell.When jesus failed to show up they went back to the drawing board and decided that he did come back,just invisibly and the end of the world was scheduled for 1914.When the end of the world didn't materialize in 1914,they went back to the drawing board and figured it out one more time.Jesus did come back,not in 1874,but in 1914, again invisibly.Apparently he would go away for a few years and return again in 1919 to choose the WTS as the only true religion on earth.
Goldminer