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 231717 Douglas Stone Jul-18-2012 How do you layout a rectangle for a football field.so ```I remember some of a method my dad used to layout a foundation when he was building a house. I can only remember part of the method where he measured 3 ft on on side of the corner and 5ft the other side of the corner and he calculated a number and would measure that distance as a 45 degree angle between the 3 and 5 foot marks he had made. He would have one corner fixed and the other he would move the calculated distance and the corner would be square. Some of my recollection maybe wrong as it has been decades since I have seen this done so please correct me where needed. Can someone who is familiar with this layout method please tell me how to do it. If you have a better of easier method than the one I described please post to this so we can get a practice field laid out for our high school marching band to practice on. Thanks Douglas V Stone ------------------------------------------------------------------------ ``` 231719 Charlie Rodgers I remember some of a method my dad used to layout a foundation when he was > building a house. I can only remember part of the method where he > measured 3 ft on on side of the corner and 5ft the other side of the corner > and he calculated a number and would measure that distance as a 45 degree > angle between the 3 and 5 foot marks he had made. He would have one corner > fixed and the other he would move the calculated distance and the corner > would be square. Some of my recollection maybe wrong as it has been decades > since I have seen this done so please correct me where needed. Doug, I'm sure I'll be one of many to respond...Just use Pythagoras' Theorem (a-squared + b-squared = c-squared). Here's a site that explains it: http://www.mathsisfun.com/pythagoras.html A right angle (90 deg) can be laid out by establishing your base line and then run another line more or less perpendicular to it. Measure and mark 3 feet (inches, meters, millimeters...whatever your unit of measurement is) along the base line from the intersection of the two. Measure and mark 4 units from the intersection on the perpendicular line. Place one end of your measuring device on the 3 mark and lay the body of the device on the 4 mark. Adjust the line with the 4 mark on it until it fall directly on the 5 mark of your measuring device. You now have a 90 degree corner. If you're laying out a 90 degree angle on paper, the Old Millwright has explained it better than I can so I imagine he'll chime in and point you to his 'how-to'. I think it's on Wiktor's site but then my memory isn't what it used to be ;-) Charlie Rodgers Clinton, Maryland ------------------------------------------------------------------------ ``` 231720 Charlie Rodgers On 7/18/2012 8:52 PM, Douglas Stone wrote: >> I remember some of a method my dad used to layout a foundation when he >> was >> building a house. I can only remember part of the method... snip >> since I have seen this done so please correct me where needed. > > Doug, I'm sure I'll be one of many to respond...Just use Pythagoras' > Theorem (a-squared + b-squared = c-squared). Here's a site that > explains it: > http://www.mathsisfun.com/pythagoras.html Doug, I realize it's poor form to respond to my own post, but I forgot another tip that may come in handy. After you lay out the field, measure diagonally (criss-cross) from corner to corner. When the measurements are equal, you have a rectangle with four 90 degree corners (instead of a parallelogram). Charlie, who actually enjoyed plane and solid geometry in school... ------------------------------------------------------------------------ ``` 231723 James Thompson Jul-18-2012 Re: How do you layout a rectangle for a football field.so ```> > Doug, I realize it's poor form to respond to my own post, but I forgot another tip that may come in handy. > After you lay out the field, measure diagonally (criss-cross) from corner to corner. When the measurements are equal, you have a rectangle with four 90 degree corners (instead of a parallelogram). Provided only that the 4 sides are equal. James Thompson, the oldmillrat Of all the things I have ever lost, I miss my mind the most. ------------------------------------------------------------------------ ``` 231725 Charlie Rodgers > >> Doug, I realize it's poor form to respond to my own post, but I forgot another tip that may come in handy. >> After you lay out the field, measure diagonally (criss-cross) from corner to corner. When the measurements are equal, you have a rectangle with four 90 degree corners (instead of a parallelogram). > > Provided only that the 4 sides are equal. > Jim's right. If you're talking about a square (four equal-length sides), the diagonals will be the same length. But not only in a square. I thought that a practice field would likely be a rectangle. The diagonal measurements will also be equal in a rectangle. Charlie Rodgers Clinton, Maryland ------------------------------------------------------------------------ ``` 231726 Joseph Parker Jul-18-2012 Re: How do you layout a rectangle for a football field.so ```> I thought that a practice field would likely be a rectangle. The > diagonal measurements will also be equal in a rectangle. Necessary, but not sufficient. For example, a symmetric trapezoid will also have equal diagonals and the corners are not necessarily right angles (Galoot version: imagine a four sided figure with a 2 inch top parallel to and centered over a 4 inch bottom (2 cm top over a 4 cm bottom, Jeff)). Joe Parker, Ph.D. Mathematics, 1976 ------------------------------------------------------------------------ ``` 231727 "Cliff Rohrabacher Esq." I remember some of a method my dad used to layout a foundation when he was > building a house. I can only remember part of the method where he > measured 3 ft on on side of the corner and 5ft the other side of the corner > and he calculated a number and would measure that distance as a 45 degree > angle between the 3 and 5 foot marks he had made. He would have one corner > fixed and the other he would move the calculated distance and the corner > would be square. Some of my recollection maybe wrong as it has been decades > since I have seen this done so please correct me where needed. > > Can someone who is familiar with this layout method please tell me how to > do it. If you have a better of easier method than the one I described > please post to this so we can get a practice field laid out for our high > school marching band to practice on. > > Thanks Douglas V Stone > ------------------------------------------------------------------------ > OldTools is a mailing list catering to the interests of hand tool > aficionados, both collectors and users, to discuss the history, usage, > value, location, availability, collectibility, and restoration of > traditional handtools, especially woodworking tools. > > To change your subscription options: > http://ruckus.law.cornell.edu/mailman/listinfo/oldtools > > To read the FAQ: > http://swingleydev.com/archive/faq.html > > OldTools archive: http://swingleydev.com/archive/ > > OldTools@r... > http://ruckus.law.cornell.edu/mailman/listinfo/oldtools > ------------------------------------------------------------------------ ``` 231733 "Bob Burgess"