Abstract: A portable recorder has a pinch roller moved to engage a capstan, a recording head brought into a recording position and a motor to power the recorder switched on through the sliding movement of a slide assembly in engagement with the case of the recorder near a hinge between bottom and top portions of the case. The capstan is rotated about an axis substantially perpendicular to the plane of the case by a pulley arrangement driven by the motor with an axis substantially within a plane parallel to the case. The recording head is mounted to the slide assembly which includes a roller attached to the back thereof for rotating engagement with the case when it is opened and closed. Rotating movement of the roller causes the slide assembly to move back and forth within the case as the top of the case is opened and closed causing the recording head to move near or away from the tape. A spring mounted to the case and the slide assembly biases the slide assembly to a remote position when the case is opened.

Abstract: A modular form of construction for electrical probes featuring releasably interconnected, standardized modules that can be individually replaced in the field. Included are a modular probe head, a probe cable, and both releasably locking and non-locking output terminations, including a panel mounting termination for inclusion in an electrical instrument.

Abstract: Iontophoresis apparatus for applying local anesthetics to selected locations of animal bodies, particularly to the eardrum, comprises an electric circuit providing a source of direct current of constant and predetermined magnitude. Connected into the electric circuit are a first electrode adapted for placement in a quantity of ionized liquid anesthetic and a second electrode adapted for placement in contact with the body in a spaced location. A current adjustment circuit adjusts the current to selected values. Application of a constant current which may be progressively increased or diminished at the will of the operator provides effective iontophoretic action resulting in efficient anesthetization of the body area without adverse effects.