Ben Franklin invented the lightning rod in the 1750s. Harrison's marine chromometer. Achromatic lenses: interestingly, they were really from the 1730s and then

Ben Franklin invented the lightning rod in the 1750s. Harrison's marine chromometer. Achromatic lenses: interestingly, they were really from the 1730s and then sat on: https://en.wikipedia.org/wiki/Achromatic_lens https://en.wikipedia.org/wiki/Achromatic_lens. The navigational sextant: also found in Newton's unpublished writings. (But I'm disinclined to feel smug about these delays, compared to some bits of computing history.) "First high-quality cement using hydraulic lime since Roman times." The https://en.wikipedia.org/wiki/Lever_escapement https://en.wikipedia.org/wiki/Lever_escapement. Lind's treatment of scurvy, and an early attempt at vaccination. Some chemistry of practical import. So, I agree: the 1800s beat the 1750s in the invention cage-fight. Source: https://en.wikipedia.org/wiki/1750_in_science https://en.wikipedia.org/wiki/1750_in_science and following, from which I left out science and math discoveries.