S30E4: Witness Samples, Pressure Washers, Beehives, Cast Iron Cookers

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, cleaned and seasoned to create heavy outdoor cookers.