It is part of the natural physics of water and other fluids to always find their level and remain flat. If disturbed in any way, motion ensues until the flat level is resumed. If dammed up then released, the nature of all liquids is to quickly flood outwards taking the easiest course towards finding its new level.
Because if a part of the surface were higher than the rest, those parts of the fluid which were under it would exert a greater pressure upon the surrounding parts than they receive from them, so that motion would take place amongst the particles and continue until there were none at a higher level than the rest, that is, until the upper surface of the whole mass of fluid became a horizontal plane.” -W.T. Lynn, “First Principles of Natural Philosophy”
If, however, the Earth is a giant sphere tilted on its vertical axis spinning through never-ending space then it follows that truly flat, consistently level surfaces do not exist here! Moreover, if the Earth is spherical then it follows that the surface of all Earth’s water, including the massive oceans, must maintain a certain degree of convexity. But this is contrary to the fundamental physical nature of water to always be and remain level!
The sense of sight proves this to every unprejudiced and reasonable mind. Can any so-called scientist, who teaches that the earth is a whirling globe, take a heap of liquid water, whirl it round, and so make rotundity? He cannot. Therefore it is utterly impossible to prove that an ocean is a whirling rotund section of a globular earth, rushing through ‘space’ at the lying-given-rate of false philosophers.” -William Thomas Wiseman, “The Earth An Irregular Plane”
In Cambridge, England there is a 20 mile canal called the Old Bedford which passes in a straight line through the Fenlands known as the Bedford Level. The water has no interruption from locks or water-gates of any kind and remains stationary making it perfectly suitable for determining whether any amount of convexity/curvature actually exists. In the latter part of the 19th century, Dr. Samuel Rowbotham, a famous Flat-Earther and author of the fine book, “Earth Not a Globe! An Experimental Inquiry into the True Figure of the Earth: Proving it a Plane, Without Axial or Orbital Motion; and the Only Material World in the Universe!” travelled to the Bedford level and performed a series of experiments to determine whether the surface of standing water is flat or convex.
From this experiment it follows that the surface of standing water is not convex, and therefore that the Earth is not a globe! On the contrary, this simple experiment is all-sufficient to prove that the surface of the water is parallel to the line-of-sight, and is therefore horizontal, and that the Earth cannot be other than a plane!” -Dr. Samuel Rowbotham, “Zetetic Astronomy, Earth Not a Globe! An Experimental Inquiry into the True Figure of the Earth: Proving it a Plane, Without Axial or Orbital Motion; and the Only Material World in The Universe!” (12-13)
Near the last one he also positioned a longer, 8 foot staff bearing a 3 foot flag so that its bottom aligned precisely with the tops of the other flags. He then mounted a telescope at a height of 5 feet behind the first flag and took his observations. If the Earth was a globe of 25,000 miles, each successive flag would have to decline a definite and determined amount below the last. The first and second flags simply established the line of sight, the third flag should then fall 8 inches below the second, the fourth flag 32 inches below, the fifth 6 feet, the sixth 10 feet 8 inches, and the seventh flag should be a clear 16 feet 8 inches below the line of sight! Even if the Earth was a globe of a hundred thousand miles, an amount of easily measurable curvature should and would still be evident in this experiment. But the reality is not a single inch of curvature was detected and the flags all lined up perfectly as consistent with a flat plane.
“The rotundity of the earth would necessitate the above conditions; but as they cannot be found to exist, the doctrine must be pronounced as only a simple theory, having no foundation in fact--a pure invention of misdirected genius; splendid in its comprehensiveness and bearing upon natural phenomena; but, nevertheless, mathematical and logical necessities compel its denunciation as an absolute falsehood.” -Dr. Samuel Rowbotham, “Zetetic Astronomy, Earth Not a Globe!” (14)
By positioning them at equal heights aimed at each other successively he proved over and over the Earth to be perfectly flat for miles without a single inch of curvature. His findings caused quite a stir in the scientific community and thanks to 30 years of his efforts, the shape of the Earth became a hot topic of debate around the turn of the nineteenth century.
Now, when theory does not harmonize with practice, the best thing to do is to drop the theory. (It is getting too late, now to say ‘So much the worse for the facts!’) To drop the theory which supposes a curved surface to standing water is to acknowledge the facts. Whenever experiments have been tried on the surface of standing water, the surface has always been found to be level. If the Earth were a globe, the surface of all standing water would be convex. This is an experimental proof that Earth is not a globe.” -William Carpenter, “100 Proofs the Earth is Not a Globe”
“Since any given body of water must have a level surface, no one part higher than another, and seeing that all our oceans (a few inland seas excepted) are connected together, it follows that they are all VIRTUALLY OF THE SAME LEVEL.” -The English Mechanic, 26th, June 1896
They say that because the Earth is so massive, by virtue of this mass it creates a magic force able to hold people, oceans and atmosphere tightly clung to the underside of the spinning ball. Unfortunately, however, they cannot provide any practical example of this on a scale smaller than the planetary. For example, a spinning wet tennis ball has the exact opposite effect of the supposed ball-Earth! Any water poured over it simply falls off the sides, and giving it a spin results in water flying off 360 degrees like a dog shaking after a bath. Astronomers concede the wet tennis ball example displays the opposite effect of their supposed ball-Earth, but claim that at some unknown mass, the magic adhesive properties of gravity suddenly kick in allowing the spinning wet tennis ball-Earth to keep every drop of “gravitized” water stuck to the surface. Again, their theory flies in the face of all practical evidence, but they have been running with it for 500 years, so why stop now?
-William Carpenter, “100 Proofs the Earth is Not a Globe” (86)
In one portion of its long route, the great river Nile flows for a thousand miles with a fall of only one foot! This is a feat which, of course, would be a sheer impossibility if the Earth had spherical curvature. Many other rivers including the Congo in West Africa, the Amazon in South America, and the Mississippi in North America all flow for thousands of miles in directions totally incompatible with the supposed globularity of the Earth as well.
Rising at an altitude above sea-level, in some cases thousands of feet above the sea, they follow the easiest route to their level - the sea. The ‘Parana’ and ‘Paraguay’ in South America are navigable for over 2,000 miles, and their waters run the same way until they find their level of stability, where the sea tides begin. But if the world be a globe, the ‘Amazon’ in South America that flows always in an easterly direction, would sometimes be running uphill and sometimes down, according to the movement of the globe. Then the ‘Congo’ in West Africa, that always pursues a westerly course to the sea, would in the same manner be running alternately up and down. When that point of the globe exactly between them was up, they would both be running up, although in opposite directions; and when the globe took half a turn, they would both be running down! We know from practical experiment that water will find its level, and cannot by any possibility remain other than level, or flat, or horizontal - whatever term may be used to express the idea. It is therefore quite out of the range of possibility that rivers could do as they would have to do on a globe.” -Thomas Winship, “Zetetic Cosmogeny” (110)
-David Wardlaw Scott, “Terra Firma” (126)
“There are rivers which flow east, west, north, and south - that is, rivers are flowing in all directions over the Earth's surface, and at the same time. Now, if the Earth were a globe, some of these rivers would be flowing up-hill and others down, taking it for a fact that there really is an ‘up’ and a ‘down’ in nature, whatever form she assumes. But, since rivers do not flow up-hill, and the globular theory requires that they should, it is a proof that the Earth is not a globe.” -William Carpenter, “100 Proofs the Earth is Not a Globe” (85)