Abstract: A see-thru engineering instrument has markings defining sets of longitudinal reference lines along its length. The reference lines are disposed inwardly of the side edges, and define segmentation patterns distinct to each set, distinguishing lines of the respective sets from each other. Lines of respective sets are preferably interposed each between respective lines of ones of another set or sets. Line segments in a single instrument, of the like illustrated, can define discrete measurable distances of any one, up to all, of {fraction (1/16)}, ⅛, {fraction (3/16)}, ¼, ½, ¾, {fraction (13/16)}, ⅞ and {fraction (15/16)} inch. The back surface of the instrument preferably has a matte finish. The width of the instrument is greater than 3 inches, preferably about 4 inches. The length is greater than 12 inches, preferably about 13 inches. The thickness is preferably about {fraction (1/16)} inch. The length/width ratio is at least {fraction (2/1)}.

Abstract: A drafting template for preparing axonometric drawings or sketches comprising a unitary, clear, substantially planar, chevron-shaped body having an apex and an antapex, an upper face, a lower face, and at least six side edges. Various embodiments of the template provide for preparing trimetric, dimetric and isometric drawings or sketches. The template is provided with indicia on an upper or lower face thereof for measuring and scaling the drawing.

Abstract: A see-thru engineering instrument has markings defining sets of longitudinal reference lines along its length. The reference lines are disposed inwardly of the side edges, and define segmentation patterns distinct to each set, distinguishing lines of the respective sets from each other. Lines of respective sets are preferably interposed each between respective lines of ones of another set or sets. Line segments in a single instrument, of the like illustrated, can define discrete measurable distances of any one, up to all, of 1/16, 1/8, 3/16, 1/4, 1/2, 3/4, 13/16, 7/8 and 15/16 inch. The back surface of the instrument preferably has a matte finish. The width of the instrument is greater than 3 inches, preferably about 4 inches. The length is greater than 12 inches, preferably about 13 inches. The thickness is preferably about 1/16 inch. The length/width ratio is at least 2/1. The markings on the instrument can include a grid of squares, marked over less than 2/3 of the overall area.