Refrigeration: 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
Materials & ChemistryII
Charcoal
Wood cooked slowly under earth
c. 4,500 BCE
needs 1, 2
6
Writing & CommunicationII
Writing
Knowledge that outlives memory
c. 3,300 BCE
needs 1, 4
7
Time & MeasurementII
Positional Numerals
Digits worth what their place says
c. 2,050 BCE
needs 6
8
Materials & ChemistryII
Leather Tanning
Raw hide, oak bark and months in pits
c. 1,500 BCE
needs 1, 2
9
Materials & ChemistryIII
Bronze
Copper and tin, harder together
c. 3,300 BCE
needs 2, 4, 5
10
Time & MeasurementIII
Measures and standards
The cubit, the balance and the metre
c. 3,000 BCE
needs 1, 3, 4
11
Materials & ChemistryIII
Glass
Melted sand you can see through
c. 2,500 BCE
needs 4
12
Materials & ChemistryIII
Iron Smelting
Wider adoption around 1200 BCE; ore, charcoal and a bloomery
c. 1,200 BCE
needs 5, 9
13
MechanicsIII
Gears
Teeth that trade speed for force
c. 300 BCE
needs 9
14
MechanicsIII
Piston Pump
Water raised by valve and piston
c. 270 BCE
needs 8, 9
15
Materials & ChemistryIII
Distillation
Separating liquids by boiling and condensing
c. 300
needs 2, 4
16
Time & MeasurementIV
Thermometer and barometer
Temperature and air pressure read on glass
c. 1654
needs 7, 10, 11
17
Energy & Prime MoversIV
Steam Engine
Heat turned into motion
1712
needs 12, 13, 14
18
Textiles & Everyday LifeIV
Refrigeration
Pumping heat out of a box
1834
Goal · needs 14, 15, 16, 17