Useful information for cotton manufacturers . ng opened to give an idea of theconstruction. It will he noticed that the case is of wood, but I wouldstate that the instruments as now manufactured are contained in dur-able metal cases, as illustrated above. It is seen that the case to these instruments is really only a framework with panels of wire netting to provide for a free and uninter-rupted circulation of the air. It will be observed that there are two dry bulb thermometers andtwo wet bulb thermometers, and also that they are electrically con-nected. The duplication of the wet and dry bulb
Useful information for cotton manufacturers . ng opened to give an idea of theconstruction. It will he noticed that the case is of wood, but I wouldstate that the instruments as now manufactured are contained in dur-able metal cases, as illustrated above. It is seen that the case to these instruments is really only a framework with panels of wire netting to provide for a free and uninter-rupted circulation of the air. It will be observed that there are two dry bulb thermometers andtwo wet bulb thermometers, and also that they are electrically con-nected. The duplication of the wet and dry bulb thermorneters issimply for mechanical reasons, this construction thereby permitting ofa more sensitive instrument. The electric current sent through thethermometers is exceedingly minute in both quantity and voltage, butquite sufficient to actuate relays, which in turn throw 12 volt currentthrough the magnets operating the electrically operated valves. 213. Atlanta, Ga., STUART W, CRAMER, Charlotte, N, C. Cramer Air Conditioning, Type B Regulator. The first instruments made, in wooden cases, are termed Type A. The Type B instruments are those in metal cases, but also like TypeA, they require changing of the wicks on the wet bulb,—not to men-tion the occasional supplying of distilled water to the water reservoirsupplying the wicks. These two types of instruments are based on thehygrometric principle. In the tables appended to this chapter, however, it will be noticedthat there are both hygrometric and psychrometric readings. My TypeC instruments are based on a new principle in the construction of wetand dry bulb instruments for indicating humidity; and the peculiarityof this new principle is that psychrometrical tables can be used in com-puting the relative humidity from the readings of the instruments soconstructed. The advantages are obvious: In the first place, at onestroke the troublesome changing of the wicking and covering on thewet bulb thermometers is done
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcottonm, bookyear1904
