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Posts: 3696
Member
(@flga-pls-2-2)
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How many corners have you found?

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Member
(@hollandbriscoe)
Joined: 5 years ago

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Posts: 105

I have found all three corners so this is just a matter of making the arcs work, which I am finding is an area my education may be lacking a little bit.

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(@rj-schneider)
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Crossing the street and working out the radius on the opposite row might give you a clue as to what was intended. With the distances penciled in to the nearest foot though it might only be guide. At least it would be a thorough boundary examination.

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We have plenty of old recorded plats similar to the example shown.  Although one can (at times) calculate circular curves on these plats that fit the dimensional criteria given, I'm not so sure some of them were ever actually meant to be circular curves.  I have seen a few plats that were most likely drawn with a French curve (an antique drafting tool).

Surveying within these plats can teach a surveyor a lot about understanding what was actually being shown on the document or implied by the document and what wasn't.  Assuming there is mathematical harmony and logic within some plats may just be wishful thinking.

Member
(@hollandbriscoe)
Joined: 5 years ago

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Paden, I agree wholeheartedly. This is part of the reason why I have the philosophy that curves are where the error lies

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Member
(@va-ls-2867)
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That is a bad plat.  Reminds me of a local subdivision that was created by an engineer that worked heavily on railroad projects a long time ago.  As you can guess, all of the curves were railroad curves.  Total pain assured for anyone who didn't know the engineer's history.

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Member
(@jaro)
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In the late 80's I worked for an Engineer/Surveyor that had done many subdivisions just like that in the late 60's and early 70's. The party chief/old timer that did the fieldwork was still there and still the party chief. Those subdivisions were designed on the ground and surveyed enough to make a plat in the office. There was no design and go stake it out. Any distance that was not measured on the ground was scaled between the dots on paper.

That 150 foot is the length of the arc and may have been measured with a cloth tape sorta draped around the arc where they wanted the line. Forget math, there was none.

James

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(@dallas-morlan)
Joined: 8 years ago

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Remember stories of an old timer that staked the strait lines, then turned a deflection angle to the end of the other straight line.  Once that was done cloth taped a distance and used curve table in field book to determine arc distance. Everything fit within a foot or so and nobody could measure the arc distance anyway.

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(@norman-oklahoma)
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Check the deeds. There are plats of this type recorded in the Portland area. Sometimes the lots are described by M&B in the deeds, thus filling in missing information.