Abstract: A template includes a reference panel for bringing the center of a figure to be drawn into exact alignment with the center of a previously drawn figure. The reference panel, when used in combination with a figure panel having figure holes, allows concentric figures to be drawn accurately.

Abstract: The present invention provides a self-locking-and-measuring, straight-edge apparatus designed to allow one to very accurately draw spaced parallel lines, particulary horizontal ones, the straight-edge being especially designed for ruling computer-printout forms. The apparatus comprises a scaled guide bar that is affixed perpendicularly to a drafting table, or the like, on which a straight-edge assembly is slidably and adjustably mounted, so as to move longitudinally along the scaled guide bar. The straight-edge assembly includes a base plate having a spring-biased latch positioned to selectively engage any one of a plurality of scaled notches formed along the longitudinal edges of the scaled guide bar. A straight edge is adjustably attached to the base plate.

Abstract: A digital scaler for measuring and displaying a distance on a drawing surface comprising a first triangle with a verticle straight edge and a second triangle with a horizontal straight edge slightably engaged with the first triangle along the vertical straight edge. A drive in the form of a drive wheel and pulleys are connected between the first and second triangles and can be activated to displace the second triangle with its horizontal straight edge along the vertical straight edge of the first triangle. A horizontal displacement measuring device is connected to the first triangle and engageable with the drawing surface to measure the linear displacement of the first triangle when it is drawn horizontally across the drawing surface. A vertical displacement measuring device is connected to the drive wheel and measures the displacement of the second triangle along the vertical straight edge of the first triangle when the drive wheel is rotated.

Abstract: Improvements in devices for measuring, laying out and ruling keyline boards for printed materials; a device for pre-ruling artists' and printing boards including a baseboard adapted to receive a keyline board thereon having precisely positioned location pins surrounding the work area and a slotted ruler for use with the baseboard, such producing page size and crop mark lines, bleeds, automatic register mark rules and all horizontal and vertical ruling required for 11 by 17 inch, 81/2 by 11 inch and 51/2 by 81/2 inch formats.