A ball grinding machine used for grinding pigments for inks. The pigment is placed in the jar with the stainless steel balls and the jar is then clamped in the machine and revolved for a number of hours to obtain a fine grinding. The ball grinding...
Colors Grinding Lab in DuPont's new Pigments Sales Service Laboratory at Chestnut Run. In this section of the $5,000,000 building, modern facilities are available for preparing tailor made pigments for customers in the paint, plastics, paper, ink,...
Typed caption: "Grinding paint at the Newport, Delaware Pigments plant of the DuPont Company. All important paint properties are checked on every batch of pigment before it leaves the plant."
A dye worker at DuPont's Chambers Works is shown placing dye cake in trays for drying, after the cake has been removed from a filter press. After grinding, testing and standardizing, the product is ready for shipping.
Bauxite, used in the manufacture of commercial alumina sulfate (Alum) being dropped into bings on its way to the grinding mill for pulverization at the Grasselli plant of E.I. du Pont Nemours & Company.
Bauxite as it comes from the mines, which is used in the manufacture of commercial alumina sulfate (Alum), on its way to the grinding mill for pulverization at the Grasselli plant of E.I. du Pont Nemours & Company in Philadelphia PA.
Grinding raw materials for the manufacture of alumina sulfate (Alum) at the Grasselli plant of E.I. du Pont Nemours & Company in Philadelphia PA. This product is used for purifying water.
Caption on photo: "Oliver Evans designed and constructed the first successful high pressure steam engine in America. Equipped with strong boilers of riveted iron, his engines were a great improvement over the atmospheric pressure engines, and by...
Handwritten on back: "Pa Dutch cupboard, Royal Crown Derby China, Weatherford Pitchers. Pierce items over fireplace. Pewter set and Pottery plate. Powder Grinding Mortar for Brandywine"
