@bstrand If you measure the outside diameter and divide by pi it gives you the diameter.?ÿ That's why a diameter tape has 3.14... inches per inch indicated.?ÿ?ÿ
Andy
Just an FYI from someone that as a youthful "grunt" on the crew used to make pinched pipes.
The boss bought 20' sections of what we called "gas pipe".?ÿ We would cut it in sections by hacksawing halfway through the pipe AND THEN wrench it back and forth by hand until it broke.?ÿ One smart smack with a 3 lb. pinched the pipe shut and left a thin flat edge from which to smite it into the ground.
I hated the chore.?ÿ The pipe was always oily and the hacksaw was always dull.?ÿ But it was easy hours when it rained.?ÿ
I dug one up not long back that I instantly recognized...50 years later.?ÿ Made me realize I've been doing this way too long. ;)?ÿ
OK, so you're talking about circumference.?ÿ I was confused for a moment as I've never heard it called outside diameter before.
And the graduations on your tape were "pi's" so all you have to do is read the number??ÿ That's funny, and quite clever.
How big was your tape though??ÿ You must have needed a semi to haul that thing around.
That would be handy for measuring grain bins.?ÿ Would need each unit of the tape to be equal to 12 pi-inches so you would get the diameter in feet.
I worked for a surveyor at the time of distance meters becoming available. He took that for a reason to become a one man crew. He did a number of surveys as a one man crew, but with moving tripods, walking back and forth endlessly, carrying all the gear he would often forget the monument. Or not have time during the day to move around and get them set.?ÿ
Years later following one of his surveys I would find a mechanical pencil at the corner, a screwdriver, a little nail, whatever he had in his pocket at the time. The one man crew phase lasted most of two years. Any survey done by him in those two years is a red flag when I go out even today 40 years later.?ÿ
This is a practice that was already long out of common use on the day I was born. That was during the Eisenhauer administration. I must assume that some form of mechanical advantage was employed, and that the raw material was junkyard scraps.?ÿ
They are commonly called a "loggers tape". The backside of the tape is marked off in "inches" 3.14 inches long. Wrap it around your circular object and read the diameter directly. Quite common.?ÿ
We call them "crimped-top pipe" in my neck of the woods.
Technically specific nomenclature escapes the majority of the population.?ÿ And we surveyors are lumped in there too.?ÿ I've even seen a referenced corner that called for a 1/2" machine gear.?ÿ ?ÿMost of us would recognize it as a gin spike.
?ÿ
?ÿ
I can tell when an out of town surveyor is dabbling in my area.?ÿ Many of our old neighborhood lots have "cotton mill spindles" marking their boundaries.?ÿ We usually label them as 5/8 Spindles or 5/8 Spindles with Cog.?ÿ The out of town folks usually call the ones with the cog an axle.?ÿ Not sure what they are picturing would ride on that axle.
Back to the original post I'm overjoyed when the record describes a monument even if not a complete pedigree.?ÿ A stone/IP/rebar statement especially with the tagged LS# is useful.
But in modern recoveries I just stick to fd. rebar/IP, maybe note OD if it's a big IP) with tag/cap per XXX, no need for exact dimensions, projecting/below OG, other particulars.?ÿ The tag is key.?ÿ BTW around here surveyors attached their brass tag LS# with bailing wire to rebar which quickly corroded away, so sift through the upper excavation dirt for the disconnected tag.?ÿ Monel wire should be used to attach tags to rebar but in 30 years of complaining I get the same old tripe that it's too expensive.?ÿ Duh, it's 30 bucks a spool and bailing wire is 50 cents for the same length so you're saving like 5 bucks a year by using bailing wire.
OTOH if I'm searching for an 1890 Section Corner and I find a marked stone 50' distant from some jackleg's rebar with BT evidence (scribes only in the bark litter, the tree stem is long gone, but the stump is there) I'll wax eloquent and completely describe my find on my record map and defend it based on my copious fieldbook record.
?ÿ
@bstrand We were normally measuring pipes 12 inches and under so a 6 foot long tape was more than sufficient.
I also erred when I said "outside diameter" I did mean outside circumference.
Andy
These loggers tapes are intended for measuring tree diameters. As such, they are usually marked off to measure things up to perhaps 60" in diameter. Enough Oregon trees are that big, a few are bigger.?ÿ?ÿ
Nice.
The truck thing was weak a Pi joke about the number being seemingly infinite.?ÿ Move along, nothing to see here. ?????ÿ
We find many corner posts and gate posts made of pipe, say 4", 6" or 8" approximate outside diameter.?ÿ That's the one place where we use OD when referencing a pipe.?ÿ No measurements taken, just an approximation.?ÿ The nearside base or top/center of pipe is a very handy, long-lasting reference to use for corner reports.
Caps sit on top of rebar; plugs go in pipes.
That's getting super picky
I like it!
There are lots of odd materials out there but if you purchased pipe from a normal USA supplier in the last 70 years or so it probably conforms to the Nominal Pipe Size (NPS) standard that Norman mentioned.?ÿ O.D. is fixed while I.D. varies based on pipe wall thickness (schedule or gauge) for any nominal size such as 3/4" or 1".?ÿ One can call out a nominal size pipe and the standard provides the O.D. but not the I.D.?ÿ If you ignore the standard and base your description on what you measured you must add "I.D." or O.D." to your measurement because, for instance, a 3/4" NPS pipe is 1" O.D., but it's not a "1 inch pipe".?ÿ 1 inch NPS pipe is 1.3" O.D. ?ÿ See the chart at the Wiki link for all the sizes.
For un-tagged monuments an accurate pipe description is really helpful in understanding if you're looking at the original monument or something else.?ÿ We're evidence experts, and we're really into the details, right?
You might be able to tell this is a pet peeve of mine, having seen the same monument described 5 different ways on 5 different maps and having crews tell me various pipes set at the same time for the same map by the same surveyor are all different sizes.
Unfortunately, I've seen too many field guys state the size, and I know they don't have a ruler or tape on them, and I've already measured the pipe/rod with my ruler, and I know they're estimate is wrong.?ÿ And I'm sure it happens all the time
Unfortunately, I've seen too many field guys state the size, and I know they don't have a ruler or tape on them,
Require all employees to get a tattoo ?????ÿ
Get one of these:
?ÿ
