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 July 2nd, 2017, 11:51 PM #11 Senior Member   Joined: Jun 2015 From: England Posts: 830 Thanks: 244 It is very common in construction to want a line at right angles to some building line. It is also very common for angle measuring equipment to be unavailable. I can't think why a line at 45 degrees might be wanted, but if this were the case I would set out the line using a tape and integer right angled triangles as already indicated. Along given line AB set in peg C at 3metres. Using two tapes from A and B or one flexible tape in a complete triangle, set out points D and E at right angles to AC and 4m offset. (thus the third side is 5m) set in pegs F and G along AD and CE at 3m and confirm the distance FG is 3m The diagonals AG and CF will be at 45 degrees. If I needed a 45 template for roofing timbers I would just mark out a convenient square on a piece of ply and cut it diagonally in half. The last thing I would want would be calculations and values to umpteen decimal places. Last edited by studiot; July 3rd, 2017 at 12:42 AM.
 July 3rd, 2017, 03:03 AM #12 Banned Camp   Joined: Jul 2010 Posts: 118 Thanks: 0 There is no separation ..... Well, now you talked like a mathematician who is also a physicist. There is no separation between geometry, physics, and mathematics. Therefore, it seems to me very natural to offer geometric measurement. But not everyone gets it. Thanks
July 3rd, 2017, 03:33 AM   #13
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 Originally Posted by aetzbar Well, now you talked like a mathematician who is also a physicist. There is no separation between geometry, physics, and mathematics. Therefore, it seems to me very natural to offer geometric measurement. But not everyone gets it. Thanks
You haven't offered anything that i can see. How about do away with your examples and calculations for a second, and just try explain in words what you want to say (without posting that pdf you've been posting).

July 3rd, 2017, 03:53 AM   #14
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 Originally Posted by aetzbar Well, now you talked like a mathematician who is also a physicist.
Hmmmm... I'm a Physicist who does Math. Do I count?

Unless you wander into some kind of weird bubble in the cosmos you will always get a value of $\displaystyle \pi$ that, well, is equal to $\displaystyle \pi$. It's a physical constant! You can't simply wade in and change it.

(FYI: My Master's thesis was based in trying to effectively change the weak mixing angle over a small region of space-time. It failed miserably. Take it from some experience that you don't want to go around messing with constants.)

Yeah, I know. I'm not agreeing with your results so therefore I "don't get it."

-Dan

July 3rd, 2017, 04:12 AM   #15
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 Originally Posted by Joppy You haven't offered anything that i can see. How about do away with your examples and calculations for a second, and just try explain in words what you want to say (without posting that pdf you've been posting).
I propose an experiment of measurement for a scientific institution of physics.

* Two real circles. (Steel cylinders) appear in the measurement.
The measurement should reveal a small phenomenon of inequality

Cylinder diameter to cylindrical diameter
(not equal)
to cylinder circumference to cylinder circumference.

The dramatic conclusions you can get.

Thanks

July 3rd, 2017, 04:19 AM   #16
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 Originally Posted by topsquark Hmmmm... I'm a Physicist who does Math. Do I count? Unless you wander into some kind of weird bubble in the cosmos you will always get a value of $\displaystyle \pi$ that, well, is equal to $\displaystyle \pi$. It's a physical constant! You can't simply wade in and change it. (FYI: My Master's thesis was based in trying to effectively change the weak mixing angle over a small region of space-time. It failed miserably. Take it from some experience that you don't want to go around messing with constants.) Yeah, I know. I'm not agreeing with your results so therefore I "don't get it." -Dan
http://img2.timg.co.il/forums/2/2357...506e265a07.pdf

July 3rd, 2017, 04:36 AM   #17
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 Originally Posted by aetzbar I propose an experiment of measurement for a scientific institution of physics.
Okay.

Quote:
 Originally Posted by aetzbar *
Not sure what this is supposed to signify.

Quote:
 Originally Posted by aetzbar Two real circles. (Steel cylinders) appear in the measurement. The measurement should reveal a small phenomenon of inequality
Yes it's likely the measuring apparatus will produce different results (within a certain error bracket depending on the apparatus and how it was manufactured etc.) for each of the circles. This is expected.

Quote:
 Originally Posted by aetzbar Cylinder diameter to cylindrical diameter (not equal) to cylinder circumference to cylinder circumference.
I take it this means that when comparing each cylinders diameter with the other cylinders circumference, they are found to be not equal. Again, I fail to see what this is supposed to show.

So, you want to offer an institution of physics the ability to differentiate between two cylinders diameters and their circumferences?

Last edited by skipjack; July 3rd, 2017 at 05:36 AM.

 July 3rd, 2017, 04:54 AM #18 Banned Camp   Joined: Jul 2010 Posts: 118 Thanks: 0 I try again In measuring inequality, there is always an error. If the measurement is very accurate, it exceeds the error range. Very accurate measurement, can prove inequality. Measurement, never determines equality. thanks
 July 3rd, 2017, 05:03 AM #19 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,753 Thanks: 860 Ahhhh geezzzz buddy, why don't you get an English girlfriend (or boyfriend) to help you post in clear English? I can see your next thread: prove that paper shoes size 8 (like those in an asylum!) are slightly shorter than lumbermen's size 8 boots! Note: for paper shoes in asylum, contact Joppy if you need specifications
July 3rd, 2017, 05:20 AM   #20
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 Originally Posted by Denis Note: for paper shoes in asylum, contact Joppy if you need specifications
This weeks special: Free pair for newcomers!

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