Portable drawing board for art students

A portable drawing board device for assisting in the drawing of perspective drawings, comprising:

• (a) a generally rectangular-shaped, flat drawing surface on an upper surface of the drawing board, the drawing surface being adapted for supporting a flat drawing substrate;
• (b) a pair of parallel side grooves in an upper surface of the drawing board, each being generally parallel and adjacent to one of two opposite edges of the drawing surface, and extending substantially the length of the drawing surface;
• (c) a pair of removable first slide adjusters, each slidably affixed in an opposite one of the side grooves;
• (d) a pair of movable pivot arms, each movably attached at one end to a different one of the first slide adjusters;
• (e) at least one upper groove on the upper surface of the drawing board, the upper groove being generally parallel and adjacent to the upper side of the drawing surface, generally perpendicular to the side grooves, and extending substantially the length of the upper side of the drawing surface;
• (f) a second slide adjuster slidably engaged in the upper groove;
• and
• (g) a vertical arm movably attached at one end to the second slide adjuster;
• wherein the vertical arm is extendible over a portion of the drawing surface;
• wherein the second slide adjuster is movable back and forth along a rod extending within the upper groove, the ends of the upper groove rod ending at and being attached to opposite ends of the upper groove above the bottom of the upper groove;
• wherein each of the pivot arms extend over a portion of the drawing surface from opposite sides of the drawing surface, and the pivot arms are adapted for assisting in drawing horizontal and diagonal lines on the drawing substrate;
• wherein a rod extends the length of each side groove above the bottom of the side groove, the rod having opposite ends, each being attached to and ending at an opposite end of each side groove;
• and wherein each of the rods extends through an aperture in each of the first slide adjusters;
• and each of the first slide adjusters is independently slidable along the rod;
• and
• wherein the drawing board device further comprises a one-point adjuster and a circular arm for drawing vertical, horizontal and diagonal lines from a one-point perspective, wherein the one-point adjuster, which is not a protractor, movably encircles the two pivot arms when the two pivot arms are in an adjacent position, and is slidable along both of the adjacent pivot arms simultaneously;
• and wherein the circular arm comprises a straight edge, is movably attached at one end to the one-point adjuster, and is extendible in a circular direction around the one-point adjuster.