Season 30 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #3 of 13 in Season 30•+0.2 vs season avg
Standardized witness samples are prepared, documented and preserved so manufactured materials can later be tested without damaging the finished product. Pumps, engines, hoses and control valves are assembled into pressure washers; precisely cut wooden boxes and removable frames become beehives; and molten iron is cast,

Lynne Adams
Narrator (voice)
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"Witness Samples, Pressure Washers, Beehives, Cast Iron Cookers" is episode 4 of How It's Made season 30. It scored 8.1/10 from 14 votes, ranking #3 of 13 episodes this season (season average 7.9). It aired on October 2, 2017.