. Public works . lter Sand. The Dull Tubular Washer, which wasplaced on the market last year by theRaymond W. Dull Company, 1910 Con-way Building, Chicago, was designed MUNICIPAL JOURNAL primarily to wash sand and gravel forconcrete purposes but its success war-ranted its use for more difficult ma-terials such as filter sands, foundrysands and materials containing coaldust. The machine consists of a cylin-der which revolves on chilled trunnionwheels. The inside of the cylinder hasseveral lifting angles running the totallength of the shell. The rotation ofthe cylinder causes the lifting angles
. Public works . lter Sand. The Dull Tubular Washer, which wasplaced on the market last year by theRaymond W. Dull Company, 1910 Con-way Building, Chicago, was designed MUNICIPAL JOURNAL primarily to wash sand and gravel forconcrete purposes but its success war-ranted its use for more difficult ma-terials such as filter sands, foundrysands and materials containing coaldust. The machine consists of a cylin-der which revolves on chilled trunnionwheels. The inside of the cylinder hasseveral lifting angles running the totallength of the shell. The rotation ofthe cylinder causes the lifting angles topick up the material and carry it up tothe top and then discharge over a seriesof fixed shelves. The fall of the ma-terial over the shelves scours it and asthe shelves are arranged so that thelower series is set ahead of the upperseries of shelves the material prog-resses forward as it falls. The washingwater flows in the opposite directionfrom the travel of the material, thus Vol. XXXVII, No. 1 INDUSTRIAL NEWS. THE MILWAtTKEE MAID MIXER, insuring that the material will be dis-charged where the water is cylinder retains considerable waterin the machine to do the washing. Theprogress of the material through the ma-chine is governed by moving the lowerseries of steps. By increasing the num-ber of falls of the material the mostdifficult materials can be washed. Themachines are made in four differentsizes, ranging from thirty inches indiameter and eight feet long, to sixtyinches in diameter and twenty feetlong. They are constructed of heavyboiler plate and have steel tires andtrunnion wheels with chilled tread. Theillustration shows one of the washersin operation.
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
