Some similar stuff by the same people is available . I sent a message to the site webmaster to find the status of this file but have not received a reply yet. Other army stuff here . The criteria for choosing a equal-distant projection based on possible alternative desired property. Meridians are straight lines converging on a polar axis but not at the pole.
Parallels are arcs of concentric circles concave toward a pole.
Graticule spacing Meridian spacing is true on the standard parallels and decreases toward the pole. Parallels are spaced at true scale along the meridians. Meridians and parallels is intersect each other at right angles. The graticule is symmetrical. Linear Scale Projection is mathematically based on a cone that is tangent at one parallel or conceptually secant at two parallels.