Thermometer and barometer: the whole path

1
Tools & MakingI
Stone Tools
The first cutting edge
3.3 Mya
2
Fire & ShelterI
Control of Fire
Light, heat and cooked food
1 Mya
3
Fire & ShelterI
Rope & Cordage
Twisted fibres that hold the world
50,000 years ago
4
Materials & ChemistryII
Pottery
Clay turned to stone by fire
18,000 years ago
needs 2
5
Writing & CommunicationII
Writing
Knowledge that outlives memory
c. 3,300 BCE
needs 1, 4
6
Time & MeasurementII
Positional Numerals
Digits worth what their place says
c. 2,050 BCE
needs 5
7
Time & MeasurementIII
Measures and standards
The cubit, the balance and the metre
c. 3,000 BCE
needs 1, 3, 4
8
Materials & ChemistryIII
Glass
Melted sand you can see through
c. 2,500 BCE
needs 4
9
Time & MeasurementIV
Thermometer and barometer
Temperature and air pressure read on glass
c. 1654
Goal · needs 6, 7, 8