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Sprayers range in size from man-portable units (typically backpacks with spray guns) to trailed sprayers that are connected to a tractor, to self-propelled units similar to tractors with boom mounts of 4–30 feet (1.2–9.1 m) up to 60–151 feet (18–46 m) in length depending on engineering design for tractor and land size. [1]
Depending on the sprayer, the nozzle may or may not be adjustable, so as to select between squirting a stream, aerosolizing a mist, or dispensing a spray. In a spray bottle, the dispensing is powered by the user's efforts, as opposed to the spray can, in which the user simply actuates a valve and product is dispensed under pressure.
Battery Steele was part of a comprehensive program begun in 1940 to replace obsolete coast defenses, many of which dated from the Endicott Program of 1885-1905. In the Harbor Defenses of Portland, the only large-caliber (8-inch or larger) pre-war battery still in use by 1944 was Battery Foote at Fort Levett, Cushing Island, casemated like Battery Steele to resist air attack and armed with two ...