is why we can't have nice things....
.
.
.
.
..
.
.:-|
Let me guess State Highway maintenance with a bush hog. That is what normally gets em aournd here. I know of 4 that I pass daily with about a 30degree lean to em, care of DOT.
> Let me guess State Highway maintenance with a bush hog. That is what normally gets em aournd here. I know of 4 that I pass daily with about a 30degree lean to em, care of DOT.
actually- utility plowing
Looks like you can have a nice thing in your office, if you choose to haul it off. (After filing a recovery note, off course.)
P.S. I'm told that NGS is moving to DSWORLD as the sole method of filing recovery notes and uploading mark photos. The Mark Recovery web form will eventually be removed.
Okay, besides the obvious ability of construction/maintenance workers to destroy survey monuments, one thing strikes me about this photo. Notice the nice drill hole adjacent to the cast triangle. Who in their right mind would do such a thing. I mean, it is a control point. Just adjust the coordinates to match the existing mark. If you are using it a s property monument (which I doubt) then call if off or live with the couple of hundredths. I just saw the same thing in Wyoming on a bench mark in the middle of no where.
John - USC&GS intentionally drilled the marks for a number of years around the 50's amd 60's to allow for air release while pushing the brass disk into the wet cement. They discovered that also allowed water to get into the disks and freeze causing problems and discontinued the practice.
The cross is the actual mark, as always for their monuments.
Kurt
I believe at some time in the 1950's the USC&GS experimented with a manufactured hole in the disk to let air out when it was cemented into place. They later dropped the idea.
> Notice the nice drill hole adjacent to the cast triangle. Who in their right mind would do such a thing.
It is, more likely than not, an air release hole. I'm told that drilling an air release hole was official practice on the C&GS mark setting crews for a period of some years. The theory was that the hole would allow the concrete to adhere better to the bottom of the cap, thereby forming a stronger installation. At some point the practice was abandoned as not worth the effort, but there are a whole lot of marks out there with air release holes in them.
Early in my career I was fooled by one and used it as the mark.
I'll bet that's an air release hole...
no, based on what I've read above, it's an air release hole.
and I read the hole thing. but I did not know that until I read this thread, so you could be right, it may be an air release hole.
WHO YOU CALLIN' AN AIRHOLE??!! +o(
😛
Were you able to recover the subsurface mark?
54 years ...
Was it a Class C mark?
Has a nice name anyway
Data sheet for TN0910 CRYSTAL
TN0910 HORZ ORDER - SECOND
Elevation is VERTCON
There is a POOR report from 2011
Well you learn something every day. I'm not sure I have ever seen one of these before so I just figured it was some dork that did it.
Thanks for the lesson.
John
[sarcasm]well- you where in WY- you should have KNOWN they don't dimple ANYTHING there!!!![/sarcasm]
Right , Mighty? 😉
No one will be coming along to rehab that monument. I think it's up to us. If you have a use for them and wish to perpetuate their location, it will take a little manual labor.
It could be that the underground mark was disturbed also, but if not, the monument performed as intended.
