Show COUNT THE DUST PARTICLES of united states state department of agriculture are investigating the atmosphere in connection with the solar radiation work ot of the weather bureau united states department of agriculture a dally daily count Is being mode made of the number of dust duet particles in the at mos phera at washington agton to make the count the air ly esaure within the dust counter Is suddenly decreased causing a line of dut dust to be precipitated on glass where the particles are counted with a microscope having a magnification of 1000 diameters on quiet mornings as a in many any is as dutt dust particles per cubic centimeter have been counted but on clear morn morning ing following precipitation the number drops drop to ISO most mont of the particles appear to be extremely fine minerals or organic matter from the earths earth surface gurvace gur face al though some unconsumed carbon from smoke gypsum and calcite from building operations operation and material have been observed ob gerred undoubted ly there are many particles cloa which while large enough to act an ae nuclei for coode matlon are too small to b be en through a microscope with a in ing g P power ow or of I 1 1000 dam 1 e t aret |