Useful information for cotton manufacturers . the well-known principles of the wet and dry bulb ther-mometer type of hygrometer, which is recognized the world over as theonly type of standard instrument for that purpose. Many attemptshave been made to devise instruments that would take the place ofthis wet and dry bulb type of hygrometer, but they have all been igno-minious failures, they generally depending upon the behavior or mis-behavior of vegetable or animal fibres or materials under different at-mospheric conditions. For convenience I refer to this type of hygro-meter as the mechanical
Useful information for cotton manufacturers . the well-known principles of the wet and dry bulb ther-mometer type of hygrometer, which is recognized the world over as theonly type of standard instrument for that purpose. Many attemptshave been made to devise instruments that would take the place ofthis wet and dry bulb type of hygrometer, but they have all been igno-minious failures, they generally depending upon the behavior or mis-behavior of vegetable or animal fibres or materials under different at-mospheric conditions. For convenience I refer to this type of hygro-meter as the mechanical type. Their lack of trustworthiness is due totwo causes: The first being that humidity affects them to a differentdegree at different temperatures; and the second is the susceptibilityof the surface pores of the sensative substances to being choked up bydust, lint, etc., etc., a thin coating of which causes the indications tobecome both sluggish and erratic. Atlanta, Ga., STUART W. CRAMER. Charlotte, N. C. Cramer Air Conditioning, Type A Regulator. The above cut illustrates the general appearance of the first Auto-matic Regulator made, the doors being 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcottonm, bookyear1904
