. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. Another type of distribution is the rotary, shown here. This consists of two to four rotating brushes, disks, or hollow propellers, 8 to 12 inches in diameter, located on the ends of propeller shafts un- der the wings. The spray material is fed, by gravity, from the storage tank through valves to the hollow hubs of the rotors, and is thrown outward into the slipstream of the propeller and the down-wake from the wings. No pumps are required for this system. There are two other types of distribu- tion, neither of which is wi
. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. Another type of distribution is the rotary, shown here. This consists of two to four rotating brushes, disks, or hollow propellers, 8 to 12 inches in diameter, located on the ends of propeller shafts un- der the wings. The spray material is fed, by gravity, from the storage tank through valves to the hollow hubs of the rotors, and is thrown outward into the slipstream of the propeller and the down-wake from the wings. No pumps are required for this system. There are two other types of distribu- tion, neither of which is widely used for weed control because of certain disad- vantages. One is the breaker bar system, used for DDT spraying for mosquito con- trol. This equipment consists of a pump, control valves, and booms. The booms are located under each wing, and are drilled at intervals of about a foot or more. The boom discharge at about 100 psi strikes a prismatic bar between the boom and the trailing edge of the wing. The resulting spray is a wide swath of fine droplets. This system is rarely used because the droplets are too small, and it is difficult to control the width of swath and the amount of liquid discharged. The other system is an engine-exhaust aerosol whereby liquid material is fed into the engine exhaust and discharged as very fine droplets (10 microns and under). Both systems produce droplets which classify as an aerosol and are not suitable for weed spraying. f37]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Akesson, Norman B. (Norman Berndt), 1914-; Harvey, W. A. (William Alfred), 1914-1989. Berkeley, Calif. : University of California, College of Agriculture, Agricultural Experiment Station
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Keywords: ., bookcentury1900, bookpubli, booksubjectspraying, booksubjectweeds
