Abstract: An arrow having a longitudual hollow shank portion containing a sliding element which moves forward upon the impact of the arrow with a target and twists a receiving element connected to a rotatably mounted arrowhead to rapidly rotate the arrowhead and thus give the arrowhead great stopping power when hunting game.

Abstract: A holder for canned or bottled beverages which thermally insulates the beverage and provides a message display in lamps visible on the outer surface of the holder at the election of the user of the holder.

Abstract: A work tray for mounting on hollow rung ladders. The tray has a single shaft which goes through one rung of the ladder. Lock means are provided to keep the tray from rotating or from pulling out of the rung. Angular adjustment means are provided so that the tray may be kept level when the ladder is used at different angles.

Abstract: A training device to improve the use of golf club irons by indicating whether the golfer tends to align his irons to hit a golf ball to the left or right of the true course. A slidable ball holder with golf club placement indicia is addressed with the golf iron. A vertical reference pole is mounted at one end of the slidable ball holder. A detachable long rigid slender pointer is attached as with a magnet to the striking face of the golf iron. The pointer indicates if the striking face of the golf iron is aligned to hit a ball to the left or right of the vertical reference pole.

Abstract: A shuttle type needle valve in a `T` shaped body. The needle has a beveled end and a piston which co-operate with a central tube to permit fluid flow selectively from either of the two opposite arms of the `T` shaped body to the central arm of the `T` shaped body.

Abstract: Convenience type adapter to be connected to an automobile, boat, or other storage battery by ordinary battery booster cables provided with a receptacle to receive standard type of plug and which is provided with fuses and/or circuit breakers and provision for accepting special purpose connectors to facilitate the use of the battery to operate auxiliary special purpose electrical equipment.

Abstract: A fuel nozzle adaptor for attachment to the end of a leaded gasoline dispensing nozzle to prevent the nozzle from being inserted into the filler pipe of vehicles designed to use lead free gasoline. A sleeve is provided with internal teeth to grip the tip of the nozzle. A groove or other weakened section is provided in the sleeve to cause the teeth to grip harder if strain is placed on the adaptor.

Abstract: The volume of a solid or liquid sample is determined by placing the sample in a first volume scaled sample chamber in communication with a source of liquid, a second volume scaled chamber also in communication with the source of liquid is used as a comparison or reference chamber, liquid is forced to a reference point in the comparison chamber and the position of the liquid-gas interface in the first or sample chamber is recorded, the volume of the unknown sample is then determined by the insertion of the first chamber scale reading into a previously derived formula or graph.

Abstract: Improved traction arms for vehicle anti-skid devices. The rollers or traction segments of the arms are mixed in size of outside diameter or provided with interior tipping bevels or both to give more traction.