. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. apidly below in. velocity pressure for both the ^ in. nozzle and Resistance of Materials to Flow of Air, A. E. Stagey 267 the 31/32 in. nozzle. It is interesting to note that this point correspondsto the ratio of the areas of the two nozzles. Several types of filters were tested whichmay be designated as follows: 1. Felts—Wool and cotton. 2. Cloth—China silk and cottonflannel. 3. Composite Filters—China silk andabsorbent cotton; cotton flanneland absorbent cotton ; muslin andabsorbent cotton. 4. Met
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. apidly below in. velocity pressure for both the ^ in. nozzle and Resistance of Materials to Flow of Air, A. E. Stagey 267 the 31/32 in. nozzle. It is interesting to note that this point correspondsto the ratio of the areas of the two nozzles. Several types of filters were tested whichmay be designated as follows: 1. Felts—Wool and cotton. 2. Cloth—China silk and cottonflannel. 3. Composite Filters—China silk andabsorbent cotton; cotton flanneland absorbent cotton ; muslin andabsorbent cotton. 4. Metal screens. In the manufacture of felts there is awide difterence in density due to the varia-tion in the physical properties of wool andof cotton. Felt is commercially designatedby thickness but it was found to be muchbetter and more logical for purposes of ex-perimentation to use the weight per sq. ft.,as the commercial ratings were not an indexto the density. Cotton alone will not felt so thosepieces referred to as cotton are a mixtureof 50 per cent cotton and 50 per cent FIG. 2. VIEW SHOWING AR-RANGEMENT OF PITOT TUBEAND MANOMETERS FILTERMATERIAL Experiments were made with the following felts. Two sets of feltfilters were purchased at dififerent times and are designated as A and B. Rating Cotton Wool A B . Vs in. Va in. ^ff in. /s in. A in. A in. tVin. ^in. Vs in. Vs in. t\ in. A in. Commercial weightper sq. ft. A B lb. lb. lb. lb. lb. lb. lb. lb. The cotton flannel was material purchased at a small store and had 40threads per in. The china silk had 120 threads per in. in the woof and110 threads per in. in the warp. The finish was smooth and the threadsnot twisted. These two materials furnished examples of filters with aheavy nap and with a smooth surface. Composite Filters.—The composite filters were built up of cotton fiberretained by different materials. 268 Transactions
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