With the gear set, he could measure to 0.001 millimeters.
He could also adjust to 0.001 millimeters.
Precision machining became a possibility.
The movement of the hand was rough, but operating with the gear set could be very precise.
Yet he still didn't know how to make precision machine tools.
He had been pondering a question all along: how to produce standard bolts and nuts.
Can everything be carved by hand?
He was filled with doubt.
The weather slightly warmed up.
Feeling energetic, he went to a rock outcrop by the roadside to conduct a search. He wanted to find traces of metals and other minerals.
They only had a poor iron mine.
They had ways to extract necessary ironware from the poor iron mine, but the efficiency was too low.
A blast furnace was a good solution.
But for that, the smelting furnace would be sealed, and after smelting one batch of iron, it had to be dismantled.
There was too much slag.
