What is a major invention from the 1700's?

Answer:
The piano (1709).
The lighting rod (1752).
Steam road vehicles (1769).
Steamboat (1776).
Circular Saw (1777).
Bifocals (1784).
First answer by ID1154203402. Last edit by USCitizen. Contributor trust: 5606 [recommend contributor recommended]. Question popularity: 1 [recommend question].