Thanks Dave!
This was my thought also. The owner currently thinks it is an ancient petroglyph. But it doesn’t look like any other petroglyph in the regional traditions.
The literature on the UK ordinance survey says that in the 1800s, the top groove was used by the rod person to set the consistent point for elevation. The set brass plaques come later. But there is no sign of that at this site. Given the specific location, there isn’t a good reason for it to have been surveyed and marked in the 1880s or 1890s as there isn’t any mining nearby.
It could be that it was marked during the 1840s survey, but I don’t think so. Instead, my current feeling is that IF its a survey mark, it is more likely from the 1770s survey by the Brits or the 1660s survey by the French. It might also just be some type of blaze or claim mark- indicating the land is the property of one crown or another.
Who the hell knows?
Anyway, I pushed this out to the history community because I am curious if anyone in the English or French academic circles have ever seen the symbol before from earlier contexts. Not that this would prove anything, but I thought it would be worth a shot.
Thanks for asking around!
Best,
Tim
> On Dec 9, 2020, at 10:59 AM, David Valentine <[log in to unmask]> wrote:
>
> 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] <mailto:[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>
>> <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.
>>
>>
>>
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