Figure 1 | Scientific Reports

Figure 1

From: Identifying Palaeolithic birch tar production techniques: challenges from an experimental biomolecular approach

Figure 1

Tar production method illustrations. Five methods used to produce tar include: (a) ash mound (b) condensation, (c) pit roll, (d) raised structure, and (e) laboratory furnace. Black arrows indicate the positions of thermocouples used to record temperatures during production. In the laboratory furnace, temperature was controlled with a PID device in the centre of the chamber, which regulates the gas flow to maintain a relatively constant temperature.

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