Sand and Dust

Abstract

FIGURE I is intended to show approximately, in diagrammatic form, the relative sizes of material particles which are susceptible to the action of winds of normal speeds. They range from little pebbles, on the large side, through sand grains and rain and fog drops to specks of dust and the tiny water droplets which constitute clouds. Thence, smaller and smaller, to the minute pebbles, on the large side through sand grains and rain and fog drops to specks of dust and the tiny water droplets which constitute clouds. Thence,smaller and smaller, to the minute particles that form thin smokes and hazes. The estimated diameter of large molecules of matter is include for completeness.