Bore hole declinometer

Claim 1

IN A BORE HOLE DECLINOMETER A DRILL STRING IN THE BORED HOLE, A BIT ON THE LOWER END OF SAID DRILL STRING; A DRILL COLLAR IN SAID DRILL STRING ABOVE SAID BIT, SAID DRILL COLLAR COMPRISING THE HOUSING FOR A HOLE DECLINOMETER, SAID DRILL STRING HAVING A COLUMN OF DRILLING MUD THEREIN, SAID DRILL COLLAR HAVING A PLURALITY OF SUPERPOSED CONSTRICTIONS THEREIN, A PISTON ROD MOUNTED IN SAID DRILL COLLAR FOR VERTICAL MOVEMENT THEREIN, A PISTON ON SAID PISTON ROD TO BE ACTED UPON BY THE DRILLING MUD TO FORCE THE PISTON ROD DOWNWARDLY IN THE DRILL COLLAR, A HEAD ON SAID PISTON ROD, SAID HEAD BEING MOVABLE PAST SAID CONSTRICTIONS TO CREATE A PULSE IN THE DRILLING MUD, AND PULSE RECEIVING MEANS AT THE SURFACE OF THE BORE HOLE, AND A MEANS TO RETARD THE DOWNWARD MOVEMENT OF SAID PISTON AND PISTON ROD CONSISTING OF A UNIVERSALLY MOUNTED WEIGHT, A HEAD ON THE WEIGHT, A PLURALITY OF SPACED STOP SHOULDERS ON THE HEAD, SAID DRILL COLLAR HAVING A FLUID PORT THEREIN POSITIONED ABOVE SAID HEAD, VALVE MEANS MOVABLE OVER SAID PORT TO CONSTRICT THE PORT AND REDUCE FLUID FLOW THERETHROUGH, SAID LAST NAMED VALVE MEANS BEING ENGAGEABLE WITH AND MOVABLE RELATIVE TO ANY OF THE STOP SHOULDERS TO PERMIT MOVEMENT OF THE VALVE MEANS OVER SAID PORT AND VARY THE OPENING THEREOF, THE OPENING OF THE FLUID PORT BY THE VALVE MEANS BEING APPROXIMATELY PROPORTIONAL TO THE TILT OF THE WEIGHTED MEANS, A SECOND PORT IN SAID WALL, A SECOND VALVE MEANS CONTROLLING THE SECOND PORT, AND MEANS COUPLING THE SECOND VALVE MEANS AND SAID PISTON ROD TO ACTUATE THE SECOND VALVE MEANS AS THE PISTON ROD MOVES VERTICALLY.