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THE FUNDAMENTAL PRINCIPLES OF
portance, and is becoming a subject of study among theatre men all over the country. Humidity is the amount of moisture carried by the air. This amount is determined by reading what is known as a wet bulb thermometer in combination with the dry bulb thermometer. A wet bulb thermometer is nothing more nor less than the usual thermometer with a soft cotton wick tied about the mercury bulb, and this wick saturated with water. We all know the evaporation of moisture absorbs heat; therefore, the wet bulb thermometer will read lower than the dry bulb thermometer. The evaporation of the moisture from the wick which surrounds the mercury bulb will cause a cooling effect and produce a lower reading. The difference of the reading between the wet and dry bulb thermometer combined with the reading of the dry bulb thermometer when referred to a chart, known as a Relative Humidity Chart, will give you the relative humidity of the air in your theatre.
Relative humidity means the percentage of moisture carried by that air with relation to its maximum or saturated condition. In brief, relative humidity of fifty, means that the air is carrying 50% of the maximum quantity of moisture which could be absorbed by that air.
The relative humidity combined with the dry bulb reading when referred to a chart drawn up by the American Society of Heating and Ventilating Engineers, known as the Comfort Chart, will give you a point within or without a certain z;one; that zone plainly marked the "Comfort Zone. " The limits of this zone are bound by lines referred to as the summer limit of comfort and the winter limit of comfort. You should endeavor to maintain a condition in your house as closely to the comfort zone limits as possible. Keep in mind that humidity within any auditorium is for practical purposes uniform, and it is only necessary for you to have one instrument within your auditorium for taking this reading.
Some of the ventilating plants placed in our oldest theatres have no definite control over the degree of humidity, but by
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BALABAN & KATZ THEATRE MANAGEMENT