. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. Fieldner, A. C, Efficiency of the Palmer Apparatusfor Determining Dust in Air, Jour. Ind. Hygiene, vol. 2, Sept. 1920, pp. 167-81. Jour. Am SocHeat. & Vent. Eng., vol. 26, Nov. 1920. pp. 687-700. 110 Transactions of Am. Soc. of Engineers The first method was based upon comparisons of the Tyndall effectsof incoming and outgoing air as regards the sugar tube. SiHca dust andtobacco smoke were used as mediums for testing. The Tyndall effectgives efficiencies depending upon light reflected from t
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. Fieldner, A. C, Efficiency of the Palmer Apparatusfor Determining Dust in Air, Jour. Ind. Hygiene, vol. 2, Sept. 1920, pp. 167-81. Jour. Am SocHeat. & Vent. Eng., vol. 26, Nov. 1920. pp. 687-700. 110 Transactions of Am. Soc. of Engineers The first method was based upon comparisons of the Tyndall effectsof incoming and outgoing air as regards the sugar tube. SiHca dust andtobacco smoke were used as mediums for testing. The Tyndall effectgives efficiencies depending upon light reflected from the aggregate sur-faces of the dust particles. The second method gave efficiencies on a weight basis; dust was evolved from a smallweighable cloud producer and passedthrough a sugar tube. The weight efficiencywas found by determining the loss from thecloud producer and comparing this with theweight of dust recovered from the sugartube. As a result of the test the sugar tubenow in use has been designed. It giveshigher filtering efficiency combined withlow resistance to passage of FIG. 6. A RECENT DESIGN OFSUGAR TUBE DESCRIPTION OF THE APPARATUS NOW USED Fig. 6 shows a recent design of sugartube. It consists of a tube 2}i in. indiameter by 3^ in. long, having a restric-tion perpendicular to the wall at one end tosupport the screens which hold the sugar,and tapering thence to a smaller tube forattaching to the rubber hose leading to suc-tion. The tubes have been made of glassprincipally because glass does not add par-ticles to the sugar either by corrosion orerosion, and because of its low cost. For transportation the tubes areclosed at both ends with stoppers of either rubber or cork compositionand packed in mailing tubes. The monel metal screens are held in posi-tion by friction. This is not altogether satisfactory because the screensmay become displaced in the mails. Another tube has been used whichhas a slight bulge for retaining the screens at the restriction, but breaka
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