9 
THE AIR 
SPRfl 
A HAND OPERATED AEROSOL 
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The United States Department of Agriculture, Bureau of Entomology and Plant 
Quarantine, has announced a new and extremely effective method for dispersing concen¬ 
trated insecticides. It has been determined that concentrated insectical sprays de¬ 
livered in an "atomized form" required l/20 of the quantity of insecticide for effec¬ 
tively killing flies, mosquitoes and other flying insects, as compared with the quan¬ 
tity of dilute insecticide required by the old-fashioned, conventional household 
sprayer. A hand operated device for fine atomization or "aerosol dispersion" was 
initially developed in the early part of the War by H. 0. Schroeder in conjunction 
with the United States Department of Agriculture at Orlando, Florida, for use in the 
armed forces. An improved development of this initial device has now been converted 
into a commercial adaptation known as the AIR-O-SPRA, by the Paul Engstrum Associates, 
The AIR-O-SPRA is refillable and can be conveniently filled by the user. A re¬ 
movable filler plug is located externally, similar to the cigarette lighter. The 
concealed reservoir has a capacity of three fluid ounces, which is sufficient for 
effectively treating several hundred thousand cubic feet of space with concentrates. 
The new concentrate is packaged in three ounce cans, similar to the lighter 
fluid can, to afford convenient filling. 
Various features of the AIR-O-SPRA distinguish the device. It has a pleasing 
appearance, easy to operate, and gives a reliable performance. It resembles a flash¬ 
light and is approximately eight and one-half inches in length and one and five- 
eighths inches in diameter. The exterior shape is not only attractive, but also com¬ 
fortable in the hand as the device is operated. Plastic materials in attractive 
colors are utilized in fabrication of the exterior parts of the household model. 
The inside parts which hold the chemical are metal. A push-button control valve 
automatically closes the liquid line when the device is not in use. 
The functional parts have been scientifically designed and are built to precise 
specifications to assure ease of operation and reliable performance. The AIR-O-SPRA, 
when operated, discharges a mist that suspends freely in the air; this mist is a true 
aerosol, 
This new, 
Government for 
improved hand operated aerosol (AIR-O-SPRA) is now being used by the 
special purposes. 
PATENTS AND COPYRIGHTS APPLIED FOR 
PAUL ENGSTRUM ASSOCIATES 
Consulting-Industrial Engineers 
ROOM S03 DUPONT CIRCLE BLDG. 
1346 CONNECTICUT AVE. N. W. 
WASHINGTON 6, D. C. 
TELEPHONE: MICHIGAN 0668 
RESIDENCE: EMERSON 0352 
Specializing in Scientifically developed atomizers 
and spray Dispensers for Concentrate 
