Factormatic slide rule

Claim 1

A slide rule, comprising: a frame including side members joined at their respective end portions in parallel spaced relation by an end member, each said end member having an index line scored thereon transversely of said frame; a slider slidably supported by said side members for movement longitudinally of said frame, said slider having an end line scored on its respective end portion in cooperative simultaneous registerable relation with respect to the end member index lines, said slider having indicia thereon located in a predetermined order and at a predetermined spacing, said indicia corresponding to quantitative parameters and comprising a logarithmic scale, said logarithmic scale being divided to form a plurality of segments of equal length extending longitudinally between the end lines of said slider in parallel juxtaposed progressive relation forming a like plurality of scale lines; and, means cooperating with said frame and said slider for aligning a first selected quantitative parameter with a second selected quantitative parameter producing an indication of an unknown quantitative parameter and its magnitude, said means including a cursor slidably supported by said frame for longitudinal movement therealong, said cursor having a hairline extending transversely of said frame and having an indicator scored thereon, said indicator overlying the position of said scale line containing the lowermost values of said logarithmic scale, and, scale line calculator means on said cursor and cooperating with said indicator for determining which scale line of said plurality of scale lines contains the unknown quantitative parameter, said scale line calculator means including a rectangular strip supported by said cursor for to and fro movement transversely of said frame, said strip having a repeating series of indicia scored thereon with the value of each series of the repeating series of indicia corresponding to the numerical value of the plurality of scale lines when consectively numbered transversely of said slider, the spacing between the indicia of each repeating series of indicia being such that each indicia coincides with the position of one of the scale lines of said plurality of scale lines when one of said repeating series of indicia is disposed in overlying relation with respect to said plurality of scale lines.