MACHINES INTENDED TO BE INTERPOSED IN AND ACROSS A SEWAGE STREAM AND ADAPTED TO INTERCEPT AND SCREEN SOLIDS CARRIED BY THE SCREEN AND PERMIT THE SEWAGE LIQUOR AND THE UNSCREENED SMALL SOLIDS TO PASS THERETHROUGH, AND TO TRITURATE THE SCREENED SOLIDS UNTIL THE SAME ARE REDUCED TO A SIZE TO BE CARRIED THROUGH THE SCREEN OF THE MACHINE BY THE SEWAGE STREAM