The combination of claim 1 and wherein a third vertical side portion of said case means also contains a pocket means for storing extra ones of said ordinate and abscissa cards.Ĥ. The combination of claim 1 and wherein said ordinate card and said abscissa card each contain a corresponding plurality of scales, the values of corresponding scales on said respective ordinate and abscissa cards having an identical constant relationship to the values of corresponding respective preceding scales, the values within said corresponding scales each forming a linear progression and wherein said linear progressions of said corresponding scales are related to each other by a constant factor.ģ. In a variable linear graph, the combination of rectangular case means having a horizontal top surface portion and vertical side portions, at least two of said side portions being orthogonally adjacent to each other thereby establishing an ordinate side and an abscissa side, each of said two side protions containing therein pocket means, on said surface portion there being first and second sets of lines intersecting each other to form an orthogonal graph arrangement of ordinate and abscissa lines having an origin at one corner thereof, at least one each of an ordinate card and an abscissa card, each of said cards respectively including at least one scale thereon, the divisions of the scale of said ordinate and abscissa cards corresponding respectively to said ordinate and abscissa lines, said ordinate and abscissa cards being independently insertable into said respective pocket means of said ordinate and abscissa side portions such that the scales thereon are respectively adjacent to said ordinate and abscissa lines, and arm means pivotally attaahed to the surface of said case means at said origin of said graph to rotate on said graph.Ģ. The cards can be slidably arranged to have one of the scales thereon adjacent to the edge of the graph whereby the scales on the ordinate and the abscissa cards are utilized to define the divisions on the orthogonal graph.ġ. Each of the cards includes at least one scale thereon, such that the divisions of the scale of the ordinate and abscissa cards correspond respectively to the lines forming the orthogonal graph. A first card, designated as an ordinate card, is insertable in one of the side pockets and another card, designated an abscissa card, is insertable in the other side pocket. The rectangular case includes vertical side portions, at least two of which are orthogonal to each other and include pockets for holding various cards. A pointer is attached at the origin permitting the pointer to swing across the graph surface. The graph includes a rectangular case having orthogonal graph lines thereon, with an origin at a corner of the graph. A mechanical graph for calculating the linear relationship between two values.
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