Abstract: A device is provided for measuring a subject's reaction to stimuli, i.e., to measure a subject's indication of attitude, opinion, judgement, preference, evaluation, feeling, intention, etc. when presented with a question, problem, fact, situation or other stimuli the subjective response to which is sought to be measured, said device comprising a first means having a defined viewing area and a colored means having at least one colored area adapted to be viewed in said viewing area wherein the extent of colored area viewable is variable and adapted to indicate the degree of a subject's reaction to a specific stimulus.

Abstract: A calculational aid is provided, in the form of a slide rule, to facilitate calculation of damages inflicted by a nuclear detonation. The particular apparatus permits calculation of the effects of an air blast, due to static overpressure, resulting from such a detonation. Appropriate scales, properly spaced in particular relationships, are provided on a slide rule, thus providing a means for performing the calculational functions described above. The calculations utilize five parameters, and the present invention provides an apparatus for determining any one of the five parameters once the other four are known.

Abstract: 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.

Abstract: An instrument for facilitating the calculation of equivalent values includes a plate bearing symbols representing units and dimensions, the plate having a window in which a movable pointer is located. The pointer is movable from a first position representing a first set of units and dimensions to a second position representing an equivalent set of units and dimensions.

Abstract: A hand calculator is described for converting monetary amounts from one currency to another comprising a slide with a plurality of parallelly disposed logarithmic scales thereon, a sleeve engaged with the slide and having an index means, and a cursor slidably engaged about a portion of the sleeve and having an index means thereon. For facilitating the calculation of gratuities as well as for converting currencies, the logarithmic scales are laterally oriented such that adjacent scales are displaced by a factor of 15 percent (or 0.15). In an alternative embodiment, the cursor has means for receiving a movable marker which may be used to mark a scale to which the user wishes to later refer.