PennDOT highway plans from 1929. It appears to mean "Point Of Tie", since P.C., P.I. and P.T. are all used correctly. It is on a straight section between curves and there are three ties to concrete mons with iron pins. One may actually be recoverable. The other two are just off the corner of a barn and the corner of a stone barnyard wall that I surveyed more than 40 years ago. I did not know to look for these monuments back then and the barn, it's stone foundations and the stone wall are long gone. The recoverable one is along the P.Q. property line extended and pretty much undisturbed these last 80 years. 194' to the North I have a P.T. with 3 ties located in a recoverable area. 225' farther North is a P.I. with 3 tie calls in a recoverable area. All are concrete mons with iron pins. I have good tangent line shots to the South so can readily calculate using scaled ties to several houses I have already located.
225' North of the P.I. is the P.C. without ties, but 77' further is an angle point intersection with 3 streets that were all curbed in 1929. The 3 ties are to lead plugs with brass screws. Alas all curb and sidewalk was replaced 20 years ago when the Boro installed sewer so they are gone. However a good number of located structures are still in place, plus I taped the new curb and it is within tenths of scaled curb to curb distances. I will be locating 3 dwellings, some steps, curb on 2 streets, a retaining wall and a store with 2 sets of original steps, and several wall jogs, giving me a dozen plus scaled ties to the P.I. With that I can set my geometry and look for the concrete ties within tight circles.
I would like a confirmation on the "P.O.T." terminology as it wiil be cited if that monument is recovered due to it's proximity to the P.Q. I am satisfied with "point of tie" but it may actually have a better meaning.
Paul in PA
Point on tangent. P.O.S.T would be point on semi-tangent....at least around here.
''Point On Tangent'' Makes It Clearer
Thanks R.F. 🙂
Paul in PA
Around Here
POT = Point on Tangent
POC = Point on Curve
But unlike PC, PT, and PRC, a POT and POC are not unique.
There are an infinite number of POT's and POC's but only a single PC & PT for each curve.
Ok, I gotta ask, whats P.Q. ?
Point on tangent has always been my understanding of P.O.T., however, plans of that era always seem to have some surprises.
Nomenclature, old plans:
POT = Point On Tangent
BC = Begin Curve
EC - End Curve
Curtis Brown probably used this nomenclature. Dad used to work with him, and Dad NEVER heard of PC PT etc.
N
> Ok, I gotta ask, whats P.Q. ?
Why it's the Province of Quebec of course. Je Me Souviens!
Paul -- My grandfather who started out with PennDOT in the 1950's always taught me that POT meant Point of Tangency (which is pretty much what everyone else has said)
I agree with Rankin. On highway plans, P.O.T. has always been a "Point On Tangent". On some of the long straight stretches I have been on, usually at about a 1000' spacing.
B-)
> Paul -- My grandfather who started out with PennDOT in the 1950's always taught me that POT meant Point of Tangency (which is pretty much what everyone else has said)
I am not sure I am reading it the same way. I think most people are saying POT is point on tangent. (Not disagreeing about PennDOT) I learned that PT without the "O" meant Point of tangent, and POT was somewhere on the tangent line.
The highway department around here always calls a straight stretch of road a "tangent" and their plans will say 'POT' in places I think of as a 'POL' (POINT ON LINE)
My Dad taught me that "POT" meant Point on Tangent. A Point of Tangency (at the end of a curve going into a straight 'tangent') is a PT. In the ensuing 50 some years I have only seen these terms used differently on 3-4 occasions.
Propert in Question
Now that I look again, that is exactly right. Point of tangency is the PT. POT is a point on tangent. I guess that is what happens when I start work too early in the day. Please disregard my first post.
''P.O.T.'' Definition On Highway Plans? Transit Note Example
Here are some examples of transit notes from the '50's
note the points are annotated PC POC and POT- I didn't make a copy of the page with the PT.
P.O.T. on TxDot plans is point on tangent.
I went to High School in Eastern Nebraska, in the early 70's. This is when the D.A.R.E. program was just starting and the local law enforcment was going around presenting a slide show on the dangers of drugs....
One of the slides was a picture of a lath with pink flagging and POT written on it, right next to a marijuana plant. I remember the comment from the officer was something like, "Like we don't know that's a pot plant...."
Years later, I'm setting a point on line, writing POT on the lath and chuckling.....:-D
Cheers,
Radar
V.A.B.M.
Many years ago (30+) I was driving up an old Jeep Trail in the Raft River Range with a young Geologist from back East. He was looking at the USGS Quad Map, pointed to a Peak that we where headed for and said:
“There's a Very Accurate Bench Mark on that one.”
It made my day!
🙂
Loyal