How Industrial-Scale Tar Production Powered the Viking Age
mariner sounds like a comparatively forward-looking excogitation , but it ’s actually been around for quite some metre . By the sixteenth century , Europeans had acquire a proficiency whereby piles of wood , placed in funnel - mould pits , were burned tardily under an oxygen - constricting stratum of an earthly concern - clay intermixture and charcoal . drip seaman from the burning wood come down into an vent pipe , from which the precious stuff was pick up ....