Guide assembly for drawing musical staff
FIG. 1 shows in perspective a top view of the assembly of our invention for drawing a musical staff, including the guide and slider disposed in operating relation. 
     FIG. 2 shows in perspective the under side of the guide of our invention with the slider removed. 
     FIG. 3 is a perspective showing, from the left-hand end, of the slider removed from the guide, the reverse side being substantially a mirror image. 
     FIG. 4 is a perspective showing, from the left-hand end, of one alternative form of the slider shown in FIG. 3, for use in combination with the guide shown in FIG. 2. The reverse side is substantially a mirror image of the side shown. 
     FIG. 5 is a perspective showing, from the left-hand end, of a second alternative form of the slider shown in FIG. 3, for use in combination with the guide shown in FIG. 2. The reverse side is substantially a mirror image of the side shown. 
     FIG. 6 shows the assembly of FIG. 1 arranged in operating relation to a work sheet upon which musical staves are being drawn. The work sheet and pen, interposed into one of the perforations of the slider, are shown in phantom for illustrative purposes only. 
     FIG. 7 is a perspective showing of the upper side of a modified form of the guide shown in FIG. 2, having adjustable cross arms. 
     FIG. 8 is a perspective showing of the under side of the modified guide of FIG. 7.