I wrote:
"Photography, maybe. The electromagnetic telegraph, and Watt's steam
engine? No. The cut-off is around 1750, about 150 years into the
scientific revolution."
To clarify, I do not mean that every single gadget invented after
1750 could only have been invented by modern people. Paperclips, for
example, could have made anytime in the last 2000 years, although the
automatic machines that make them could not have been.
The first photography was done around 1820 but I think it might have
been done earlier. I am not sure how much knowledge of chemistry went
into it, and how much was trial and error.
- Jed
