Here's something interesting see William Gascoigne 1612-1644 Wikipedia English put cross hairs on his telescopes to tell the center. I don't mean to say he mounted it on a weapon but any astronomer like Newton would have know this. Only meaning that part of the technology was there.
I agree. My point exactly ... The technology was there and the idea itself really can't be that hard to come by.
Its fun to kick around ideas and think about things.
However.
While its really easy to put in cross hairs in a telescope as I stated before this was the easy part.
ALL the technology was NOT there even by the 1800 much less 1644. IE a USABLE set of mounts. These were not really in evidence until the 1840s +- maybe 5-10 years.
They MUST be adjustable and they must be adjustable WITHOUT bending the tube. Unless we want to suppose they had internal adjustments too.
Making a set of mounts that will maintain zero on a rifle is not all that easy. It takes pretty precise fitting and the rigidity needed to maintain a zero is not all that easy, at least not at the time.
Also the scopes were small diameter to control the weight. Too much weight, too much inertia, mounts fail. So the tubes of the early scopes are 3/4. The lenses even smaller and the light gathering and field of view of a 1860s-1870s scope was abysmal my even 1920 standards.
So while they had the telescopes they probably left a lot to be desired. The mounts are another matter and it took some time to make a mounting platform he worked even in the early industrial revolution.
They did not become somewhat common and there is no written reference to them prior to the 1840 period.
If their had been any significant number of these they would have been noticed by the riflemen in the British Army. If Hanger had heard of it or seen scope sights I cannot imagine him not mentioning it. He
wrote books about shooting after all and stated he had examined "many hundreds" of American rifles.
But if there is a mention I have not seen it or heard of it.
If they perfected it why did not the men who's writings started this thread WRITE about it. Secrecy was not taken very seriously at the time so I can't imagine it being "classified". Anything used on the battlefield is not secret for very long.
If it were going to be done I would see it as some "look what I did" show off guild masterpiece in Germany or other European country.
While lack of documentation does not prove something did not exist. No documentation or evidence means its suppostion. There is no mention or evidence for the existence of a telescopic sight in use in America in the 18th century. If someone read Newton (and people DID read and if educated were actually educated) and Newton had mentioned it I can see where the interest came in.
Putting it into actual practice?
Dan