The time of the first scientific and technological revolution is vague, but it can be the beginning of Watt's invention of the first truly efficient steam engine in 1862, or the beginning of the real large-scale use of steam engines in the 1930s in 19.

It should be said that the second scientific and technological revolution started with 1866, when Siemens invented the generator and 1870, when Otto invented the internal combustion engine.

The fire and tools upstairs are obviously misunderstood. Those are not technologies.