This paper deals with the experimental and theoretical study on the trajectory of granular materials containing various particles with different diameters sprayed from a nozzle by an air flow and their deposit distribution on the ground.
Four kinds of glass beads with different mean diameters have been used in the experiment.
The influences of large particles mixed in spraying materials on the deposit distribution are investigated as follows in the experiments;
1) The position of the top of deposit distribution curves shifts downward, that is the distance between the nozzle and the top of deposit distribution curves increases.
2) The deposit area range of particlesion the ground gets smaller.
3) The deposit amount at the top of distribution increases.
The position of the top of deposit distribution curve on the ground is given by numerical solving the theoretical equations of motion regarding the particle having mean diameter in the spray.

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The particle size distribution of airborne dusts is very important problems for a design of the proper dust collector, but the measurement method except for a cascade impactor is not enough to do practical measurements.
Authors tried new type particle size analyzer of multi-type cyclone which combined micro-cyclone with different cut size, and our new method that used multi-micro-cyclone has been made in possible to measure on the particle size distribution of airborne dusts. The collection of quantity dust sample is easy with a cyclone method, in addition, if the critical particle size of cyclone is designed to agree with application objects, the extensive measurement of the particle size distribution on airborne dust is possible.

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