Abstract: Apparatus for aerosol immunization of subjects such as day old chicks and the like including an aerosol exposure chamber having controlled humidity, apparatus for providing a precisely controlled spray of vaccine in the exposure chamber at a predetermined droplet median diameter and feed rate, apparatus for continuously supplying subjects, such as chicks and the like, to and removing them from the chamber for aerosol treatment, and apparatus for maintaining the relative humidity in the exposure chamber in the vicinity of 100% to prevent significant evaporation of water droplets containing the vaccine which could cause such droplets to shrink to within the respiration range of the subjects, thus harming them.

Abstract: Apparatus for spraying trees and especially citrus trees comprising a mobile source of pressurized air adapted to be propelled along a path parallel to a row of trees to be sprayed; at least one nozzle connected to the source and having a throat in the form of a vertically oriented slip producing a sheet-like air blast whose principle plane is substantially vertically oriented; means associated with the list of oscillating the principle plane of the air blast about a substantially vertical axis through such an angle and at such a frequency as to impart an oscillatory movement to the leaf structure within the air blast thereby exposing each surface of the leaves to the blast; and a sprayhead associated with each nozzle out of the path of the air blast for spraying atomized liquid into the air blast at a location downstream of the throat.