1. AN APPARATUS FOR CONVEYING FINE GRANULAR AND PULVEROUS SOLID MATERIALS, WHICH INCLUDES: A CLOSED CONTAINER ADAPTED TO RECEIVE FINE GRANULAR AND PULVEROUS SOLID MATERIALS, FIRST CONDUIT MEANS LEADING INTO SAID CONTAINER FOR DELIVERING A CARRIER GAS THERETINTO, SECOND CONDUIT MEANS COMMUNICATING WITH THE INTERIOR OF SAID CONTAINER FOR WITHDRAWING FLUIDIZED MATERIAL CONSISTING OF CARRIER GAS AND SOLID MATERIAL ENTRAINED THEREIN FROM SAID CONTAINER, AND PRESSURE SHOCK CREATING MEANS MOUNTED ON SAID CONTAINER AND EXPOSED TO THE INTERIOR THEREOF AND OPERABLE FOR PERIODICALLY CREATING SUDDEN SHOCK-LIKE INCREASES IN PRESSURE IN THE GAS IN SAID CONTAINER.