2847.     ---------------.  [ROELEN, O.]  [Determination of Grit in Kieselguhr.]  FIAT Reel K-29, 1938, frames 7,082-7,086; PB 70,218; TOM Reel 296.

        Schulze-Harkert washing method is the only one recommended for the determination of the heavy components.  Directions are given for the analytical analysis of a specific type called kieselguhr 120.