Tim,
I asked my father, a retired civil engineer and land surveyor, what he
thought about the frame. He thought it was a possibility, and said that if
it was, there should be a brass plate embedded in the bedrock adjacent to
or under the frame.
Dave
On Sun, Dec 6, 2020 at 11:21 AM Timothy Scarlett <[log in to unmask]> wrote:
> Hi all,
>
> I’m looking for comparative information about structures like these:
> file:///Users/scarlett/Desktop/129293577_10221429802767016_5288243268648673110_n.jpg
> <file:///Users/scarlett/Desktop/129293577_10221429802767016_5288243268648673110_n.jpg>
>
> This image shows a steel frame that I think held an "above the ground"
> target for aerial photography and survey. I can’t find any other examples
> of this type of artifact using google image searches— plenty of examples of
> control point targets for aerial survey, but no discussion of historic
> methods. A couple of these are scattered around in the woods here.
>
> Anybody know any examples?
>
> Thanks
> Tim Scarlett
> Michigan Tech
>
> Photo shared publicly by Kirstin Knaup Hensley. I will follow up with her
> if anyone sends more information.
>
>
>
> ########################################################################
>
> Access the HISTARCH Home Page and Archives:
> https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=HISTARCH
>
> Unsubscribe from the HISTARCH List:
>
> https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1
>
> This email list is powered by LISTSERV:
> https://www.lsoft.com/LISTSERV-powered.html
>
> ########################################################################
>
########################################################################
Access the HISTARCH Home Page and Archives:
https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=HISTARCH
Unsubscribe from the HISTARCH List:
https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1
This email list is powered by LISTSERV:
https://www.lsoft.com/LISTSERV-powered.html
########################################################################
