Abstract: Improved quality of sound perception and discrimination in a self-powered, ear-mounted hearing aid is accomplished by pivotally mounting the sound inlet passage for 360.degree. rotation in a plane parallel to the ears of the wearer.

Abstract: Apparatus for measuring the internal field intensity H of a magnetic body having opposite poles surfaces includes an elongated magnetic potential measuring coil, one end of which is placed in contact with one of the pole surfaces of the body being measured, while the body is subjected to a magnetic field of variable intensity generated by an iron-free coil having lines of force passing through the body in directions perpendicular to the pole surfaces of the body being measured, the other end of the measuring coil being placed at a location which is uninfluenced by the magnetic potential at either of the poles of the body in one example and, in another example, being placed in contact with the other pole surface of the body. Values for B may also be measured by a second coil at the same time.

Abstract: A milking stool is attached to a stanchion with a collar which loosely encircles the stanchion so that the stool extends horizontally when positioned on the upright portion of the stanchion while allowing the stool to be moved upwardly to be suspended from a horizontal portion of the stanchion when not in use.