Pump auger
MOT V 2007.0548 (conical pump auger) L=41cm WD=11cm H=8cm WT=2566gr
Information about these tools and the experiment in 2019 to hollow an oak and compose a wooden water pump can be read on these pages. [MOT]
MOT V 2007.0548
MOT V 2015.0107 a6 Pump auger for the first phase of boring, cutting at the nose, to drill a pilot hole of approx. 4 cm through the entire trunk
Two-armed crank for the pump auger
Pump auger for the third phase of the boring
Pump auger for the second phase of boring, cutting sideways, to widen the hole trough the entire trunk to approx. 6 cm
Pump augers for the third phase of the boring, cutting sideways, to widen the hole for the pump valves and spear to approx. 8 cm
Four-armed crank for the pump auger