Man's physical universe

xanabras

280 PHYSICAL LIMITATIONS HA\E BEEN OVERCOME

It has been calculated that from 42 to 100 ounces of dust will filter

into a 15,000 cubic foot house in a year, under average conditions.

nri

Soot, Ash & Cinders

Fig. 95. (Courtesy of Servel,

Inc.)

its

Air is cleaned at the same time that

temperature and humidity are controlled

by passing it through a spray of

water. In some systems it is cleaned by

passing it through a filter of steel wool,

or oil-treated spun glass. Filters made

of felt and other fine materials are also

very efficient.

Another efficient device to remove

dust, smoke, and pollens from the air

is the "Precipitron" electrostatic aircleaner.

Unfortunately the cost of operation

including that of tube replacements

makes this method of cleaning rather

expensive; but this problem will undoubtedly

be solved in time, and for many purposes the expense is

more than paid for by the savings due to smaller cleaning bills and

longer shelf-life of merchandise.

OPERATION OF THE PRECIPITRON

Air Flow

High VolUge,^!^.

Wire //T^;;

Path of //.' v^..

Particle / ; ' I ^

Fig. 96.

Ground

The principle of the precipitron.

Source of

Positive High

Voltage

The Air Must Be Circulated.

In homes lacking forced air circulation a person standing erect may

be in a temperature of 70° F. at the breathing line, his feet may be at a

temperature of about 62° F., and the temperature at the ceiling may

be nearly 80° F.

This difference in temperature is reduced to only three

or four degrees with a circulating system.

The air is generally circulated by means of fans, which may be

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