The deposition of droplets from turbulent air flow was studied in a horizontal two inch pipe. Monodisperse droplets were used whose diameters ranged from 5 [mu] to 20 [mu]. The pipe Reynolds numbers ranged from 20,000 to 100,000. The rate of deposition may be expressed using a mass transfer coefficient. The influences of developing turbulence, gravity, movement of droplets along the pipe wall, pipe roughness and centrifugal forces on the deposition process were studied. This thesis describes in detail the experimental work. Equipment was designed and built, experimental procedures were developed and many experiments were performed.