A pad for closing the tone hole of a woodwind instrument is formed of a disc of silicone rubber having a compression set at room temperature after 22 hours no greater than about 5%. The edge surfaces of the disc are tapered, and a backing disc of sheet material is provided to facilitate installation of the elastomer disc in many instruments.

A housing is provided with an observation opening which exposes a three dimensional model of an arterial system. When a rear-lighted projection screen is placed over the observation opening, light from a projector within the housing casts a shadow of the model on the screen to simulate the view seen in arteriography procedures.

The compounds represented by the structural formulae: ##STR1## one each used for the treatment of warm blooded mammals with infarcted hearts. The compounds I and II have a totally unpredictable effect on the infarcted heart. An artificial infarct (stoppage of blood vessel) is produced, to mimic the occurrence of a heart attack. Administration of a suitable amount of the compound opens new blood channels in the heart tissue, by-passing the infarcted region, and providing a supply of arterial bloo...

A device for use in connection with a golf game or practice apparatus for simulating a fairway surface to enable a player to execute each shot as he would in actual play, especially enabling the player to "strike down" at the golf ball with the simulated feel of taking a chunk of turf but without damaging the simulated fairway surface. The device utilizes an artificial grass turf secured to a cushioned support that is movable in the direction of flight of the ball and compressible when the surfa...

An apparatus for simulating the game of golf and aiding golfers in improving their game by providing an indoor practice facility. The apparatus employs a unique penetrable grid consisting of parallel spaced-apart conductors in one plane positioned ahead of a second group of conductors in a second plane parallel to the first plane. The conductors are connected in an electrical circuit, and when the grid is struck by a golf ball, a conductor in one group engages a conductor in the other group ther...

A dental retention pin has a threaded longitudinally grooved lower shaft section, an intermediate sealing section for sealing the hole in which the pin is threaded, and an upper section embeddable in a surrounding body of restorative material. A pinhole is drilled in a tooth and the pin is inserted therein by rotation to cut threads in the dentin as fluids are vented through the groove. The sealing section then enters the pinhole to establish a sealing relationship therewith.

An absorber panel for solar energy is formed of two sheets with spacer means extending therebetween to maintain a spaced relationship between the sheets and provide a flow passage for a heat exchange liquid such as water. A pressure differential biases the sheets toward each other so that their spacing is maintained by the spacer means. The upper sheet which is exposed to solar energy may be thin, and the sheets are free to move away from each other at the location of the spacer means so that pe...

A proximal component affixed to the radius of the forearm and a distal component affixed to the hand are connected by a joint which prevents axial rotation between the components relative to the forearm axis and provides relative movement of the components about two substantially perpendicular axes which are transverse to the forearm axis for radial-ulnar hand movement and flexion-extension hand movement.

Smooth muscle tissue relaxation is produced in mammals by internal administration of a compound of the formula: ##STR1## wherein R is alkyl having 1 to 6 carbon atoms, the novel compound 2-N-isopropylamino-1,2,3,4-tetrahydro-5,6,-dihydroxy-naphthalene being preferred. Relief of bronchial asthma and relaxation of the uterine smooth muscle are among the therapeutic effects produced.

The number of steps taken while walking are counted by straining a fatigue life gauge to change its electrical resistance each time the device is stepped on by a subject. The change in resistance of the fatigue life gauge is measured to ascertain the approximate number of steps taken.