|
|
Post by heathen on Apr 18, 2015 3:53:43 GMT
LIT said this in another thread, I've shown my brother some of the videos I've watched. The one thing that really makes him wonder is how he knows water finds it's own level. He's a boat builder and works on large boats. He told me he can find measurements on boats using a tube and water. Like this, boatbuilder-tips.blogspot.com/2014/04/water-levels-for-boatbuilding.html , scroll down to see the pics, and get the idea. He can use the tube and water rather than keep making measurements around the whole boat. The tube and water is faster and accurate. We know that water finds it's own level. Yet, the oceans and large lakes are supposed to curve. Yet, in our daily lives water finds it's own level. I guess "sea level" is supposed to be the level, but there's a curve, it isn't a flat level. So, at some point water can't be trusted to show us what's level? Look at the oceans on a map, you can't look at the water, and see it as a reference point for water finding it's own level? It sounds ridiculous to consider this but it seems at some point we can't trust water to find it's own level if the earth is a globe. |
|
|
|
Post by aliveandkicking on Apr 18, 2015 6:19:22 GMT
LIT said this in another thread, I've shown my brother some of the videos I've watched. The one thing that really makes him wonder is how he knows water finds it's own level. He's a boat builder and works on large boats. He told me he can find measurements on boats using a tube and water. Like this, boatbuilder-tips.blogspot.com/2014/04/water-levels-for-boatbuilding.html , scroll down to see the pics, and get the idea. He can use the tube and water rather than keep making measurements around the whole boat. The tube and water is faster and accurate. We know that water finds it's own level. Yet, the oceans and large lakes are supposed to curve. Yet, in our daily lives water finds it's own level. I guess "sea level" is supposed to be the level, but there's a curve, it isn't a flat level. So, at some point water can't be trusted to show us what's level? Look at the oceans on a map, you can't look at the water, and see it as a reference point for water finding it's own level? It sounds ridiculous to consider this but it seems at some point we can't trust water to find it's own level if the earth is a globe. 1. I have used a water guage to find a consistant survey point when building. If the boat or building was a large 300 feet long then the error created due to curvature of the earth is at most .002 of a foot. That error is so tiny it cannot interfere with the reliability of a good result. A more difficult problem is keeping the water guage the same temperature along the entire tube because the water will not be 'level' if one end is warmer than the other. 2. Once you get to very large projects such as building a canal a few miles in length you cannot get accurate results by an ordinary survey (called a plane survey) that ignores the curvature of the earth. On a 5 mile distance the error created by curvature is 14 feet. Over large distances you have to use a geodetic survey. 3. Geodetic survey show the world is an irregular shaped object that is only approximately round In summary the world is so large we can ignore curvature for everyday purposes. |
|
|
|
Post by heathen on Apr 18, 2015 6:53:32 GMT
Not my point. But, you do agree, you use water to know what is level.
So, we cannot use large bodies of water to judge it being level? That's my question. We know water seeks its own level.
At a certain point water isn't level because the earth has curvature.
That isn't my point. It isn't about every day purposes. It's that at some point water isn't level but curved.
Because the earth is an irregular shaped object, at some point water cannot be trusted to tell us what is level.
Since the shape of the earth is irregularly shaped, so it is the water that conforms to the round and irregular shape of the earth, instead of being level.
At some point, you cannot use water to judge what is generally level. I don't think saying the earth is curved orx irregular, proves water curves with it.
We know how water behaves. At some point you are saying it doesn't behave that way but conforms to irregular shapes.
|
|
|
|
Post by heathen on Apr 18, 2015 6:54:58 GMT
double post
|
|
|
|
Post by LIT on Apr 18, 2015 8:27:26 GMT
heathenI am not absolutely sure what the reality is. I know that supposedly water curves and the Earth is a sphere, but the idea that it does is quite strange indeed. We measure everything(altitudes) in reference to the water level. We use the expression above and below the sea level. However, the water "level" is not level but curved, so a mountain on the other side of the ocean is actually below the water level on this side of the ocean, but above it in reference to the water level near it. So, a building 50 miles off the coast is below the coast level, but where it is built it is above the sea level:) I know that supposedly water encircles the globe uniformly, however, this still sounds quite unreliable and like you said untrustworthy. It creates a bunch of paradoxes too.
|
|
|
|
Post by aliveandkicking on Apr 18, 2015 9:27:00 GMT
Not my point. But, you do agree, you use water to know what is level. So, we cannot use large bodies of water to judge it being level? That's my question. We know water seeks its own level. At a certain point water isn't level because the earth has curvature. That isn't my point. It isn't about every day purposes. It's that at some point water isn't level but curved. Because the earth is an irregular shaped object, at some point water cannot be trusted to tell us what is level. Since the shape of the earth is irregularly shaped, so it is the water that conforms to the round and irregular shape of the earth, instead of being level. At some point, you cannot use water to judge what is generally level. I don't think saying the earth is curved orx irregular, proves water curves with it. We know how water behaves. At some point you are saying it doesn't behave that way but conforms to irregular shapes. I am saying that water is always curved on a round earth. However over a 300 feet distance ie a very large boat, the error caused by the curve is 0.002 of a foot which is so tiny it can be ignored for the purposes of building a ship. We cannot use water to know what is exactly level. On a 300 foot boat the error is tiny. On a 5 mile canal the error would be very large. |
|
|
|
Post by lordstevenchrist on Apr 18, 2015 10:29:21 GMT
2. Once you get to very large projects such as building a canal a few miles in length you cannot get accurate results by an ordinary survey (called a plane survey) that ignores the curvature of the earth. On a 5 mile distance the error created by curvature is 14 feet. Over large distances you have to use a geodetic survey. 3. Geodetic survey show the world is an irregular shaped object that is only approximately round like this one, the perfect geodetic survey. |
|
