Apparatuis for producing smoke or fog

Claim 1

IN A FOG OR SMOKE GENERATOR; A GENERALLY TUBULAR WALL MEANS DEFINING A CHAMBER HAVING AN INLET END AND A DISCHARGE END, A FUEL NOZZLE ON THE AXIS OF SAID CHAMBER AT THE INLET END TO SPRAY FUEL AXIALLY INTO THE CHAMBER, CHANNEL MEANS IN SAID INLET END OF THE CHAMBER FOR SUPPLYING AIR AXIALLY INTO SAID CHAMBER AROUND THE FUEL NOZZLE AND CAUSING COMBUSTION OF THE FUEL TO CREATE A HOT BLAST MOVING TOWARD THE DISCHARGE END OF THE CHAMBER, NOZZLE MEANS ON THE CHAMBER AXIS FOR SUPPLYING A FOG OR SMOKE CREATING MATERIAL TO THE CHAMBER ON THE AXIS THEREOF AT A POINT SPACED FROM SAID FUEL NOZZLE SO THE MATERIAL IS ENTRAINED IN THE HOT BLAST TO GENERATE FOG OR SMOKE, THE THUS GENERATED FOG OR SMOKE PASSING OUT THE DISCHARGE END OF SAID CHAMBER, A TRUNCATED CONE ELEMENT IN THE CHAMBER BETWEEN THE FUEL NOZZLE AND THE NOZZLE MEANS DEFINING A CENTRAL APERTURE IN THE CHAMBER THROUGH WHICH THE HOT BLAST PASSES, AND MEANS FOR INTRODUCING SECONDARY AIR INTO SAID CHAMBER BETWEEN SAID FUEL NOZZLE AND SAID NOZZLE MEANS.