Portland Cement: the whole path
8 inventions to master first, in an order where each one only needs those before it.
- 1
- 2
- 3
- 4
- 5Building & CitiesII
Lime and lime mortar
Burnt stone that turns back to stone
10,000 years agoneeds 1, 2
- 6
- 7Time & MeasurementIII
Measures and standards
The cubit, the balance and the metre
c. 3,000 BCEneeds 1, 3, 4
- 8
- 9