104. Water stage recording instruments
Correspondence, receipts, and brochures for water-level recording instruments with which the Irrigation Investigations Unit conducted comparative tests. Companies include W. & L.E. Gurley, Keuffel & Esser Co., Leupold, Voelpel & Co., The Bristol Company, R. W. Sparling Irrigation and Power Machinery, Julien page Friez & Sons, Lallie Surveying Instrument and Supply Co., The A. Lietz Co., The R. Hardesty Manufacturing Co., Bacharach Industrial Instrument Co., Republic Flow Meters Co., Yarnall Waring Company, and Eugene Dietzgen Co.