62) “Samuel Rowbotham’s experiments at the Old Bedford Level proved conclusively the canal’s water to be completely flat over a 6 mile stretch. First he stood in the canal with his telescope held 8 inches above the surface of the water, then his friend in a boat with a 5 foot tall flag sailed the 6 miles away. If Earth were a ball 25,000 miles in circumference the 6 mile stretch of water should have comprised an arc exactly 6 feet high in the middle, so the entire boat and flag should have ultimately disappeared, when in fact the entire boat and flag remained visible at the same height for the entire journey.”

As said in #6, the Bedford Level experiment has been falsified multiple times, once it was done with proper controls to factor out refraction as source of error.

Fun fact, the first one to prove that the initial experiment was botched (and winning a bet by doing so), was Alfred Russel Wallace, not only a qualified surveyor, but also the often un-recognized co-creator of the theory of evolution by natural selection.

Both sides (John Hampden & A. R. Wallace) had agreed on an independent umpire (John Henry Walsh) to decide who won the bet. The umpire decided in favor of Wallace, as published in "The Field" March 26, 1870. Funny story, not only did Hampden not accept that, he even theatened to kill Wallace..

Another even funnier fact: The footage that Mr. Dubay uses is a from video called "In search of the edge of the world" that was produced in 1990 as an educational program for children on how to tackle misleading information with critical thinking. The trap was set and he totally fell for it:

Both sides (John Hampden & A. R. Wallace) had agreed on an independent umpire (John Henry Walsh) to decide who won the bet. The umpire decided in favor of Wallace, as published in "The Field" March 26, 1870. Funny story, not only did Hampden not accept that, he even theatened to kill Wallace..


https://www.youtube.com/watch?v=RIZbh3g16-8#t=17m43s

Here's the set-up of Wallace's experiment: 

 Here's what was seen through the telescope (up-down inverted), confirmed by both parties:

Here's a right-side-up-sketch of what they saw:

It is beyond my understanding how someone can see this, confirm that he sees it and then deny that it is a dead giveaway against a flat earth. For further reading, please check the following links:

http://www.cantab.net/users/michael.behrend/ebooks/PlaneTruth/pages/Chapter_02.html

http://blogs.scientificamerican.com/rosetta-stones/wallace-8217-s-woeful-wager-how-a-founder-of-modern-biology-got-suckered-by-flat-earthers/

https://en.wikipedia.org/wiki/Bedford_Level_experiment

From http://200proofsearthisnotflat.blogspot.co.uk/2016/02/debunking-dubay-60-69200.html