A slide rule cursor which is adapted for use with conventional slide rules to provide direct resolution of the resultant value of parallel and/or series impedances. The cursor is not only movable axially along the body of the slide rule in a conventional manner but is also movable perpendicularly to the axial direction of the body of the slide rule. The cursor has printed on it a series of curves from which unique values of a special coefficient referred to as .mu..sub..theta. may be readily obtained for each network of parallel and/or series impedances. This value of .mu..sub..theta. relates the individual impedances in the network through a series of relationships discovered by the inventor to the resultant value of impedance and its angle.
The present invention is directed toward an apparatus and method for the accurate and uniform diagnosis and/or treatment of varying forms of pain that a person is experiencing. The apparatus is a hand-held device displaying two complimentary scales on opposite faces bearing a slidable indicator that a person can use to describe the amount and intensity of the pain that he/she is experiencing. One side of the device displays a patient's pain scale that depicts a spectrum of pain ranging from no pain to unbearable pain. The other side of the device displays a provider's pain scale divided into discrete intervals identifying verbal and/or numerical pain descriptors. The slidable indicator is mounted on the device and overlays both scales on each side of the panel. The slidable indicator has an indicator line for each scale. The indicator lines are arranged such that when one indicator line is moved, the other indicator line is moved in a complimentary manner. The method of use provides that a patient indicate the amount of pain being experienced on the patient's pain scale using the slidable indicator. The patient is not permitted to view the provider's pain scale. A health care provider then reads and records the numerical and/or verbal pain descriptor indicated on the provider's pain scale by the slidable indicator.
