The latest in cotton planting. Washington, DC, July 15. John Randolph, engineer of the U.S. Bureau of Agriculture Engineering demonstrates a model of a variable depth cotton planter which he invented. The small white dots at which he is pointing mark the wavy line of seed as planted by this new machine which makes it possible to get a strand of cotton no matter what the moisture conditions in the soil. This planter is now manufactured by several farm machinery companies and thousands are in use in the cotton belt, The essential part of the machine is a cam which causes the planting shoe to rise and fall as the planter moves forward, 7/15/38