Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1985-10-28
1987-01-06
Haroian, Harry N.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33464, 33DIG9, B43L 700
Patent
active
046335919
ABSTRACT:
A magnification calculator has a main member and a second member that moves to selected positions along the main member. One of the members has a first set of indicia, each element of which corresponds to one of the selected positions. The other member has a first reference indicator to indicate the element chosen, which is the dimension of a selected space in which a reproduction of a selected artwork portion is to be printed. The calculator includes two edge indicators on the main member, one at a fixed location and the other slidable on the main member. The second member has a second set of indicia divided into subsets, each corresponding to an element of the first set of indicia. Setting the second member so that the first reference indicator points to the element in the first set that is the measure of the one dimension of the selected space, and aligning the edge indicators with opposite edges of the artwork portion places a second reference indicator on the movable edge indicator in alignment with the element of the second set of indicia that is the proper magnification value to make the reproduction fit in the selected space.
REFERENCES:
patent: 3878615 (1975-04-01), Peterson
patent: 4417399 (1983-11-01), Baliozian
Gillette Donald P.
Haroian Harry N.
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