http://etc.usf.edu/clipart/ Free clipart for students & teachers! Welcome to quality educational clipart. Every item comes with a choice of image size and format as well as complete source information for proper citations in school projects. No advertisement-filled pages with pop-up windows or inappropriate links here. A friendly license allows teachers and students to use up to 50 items in a single, non-commercial project without further permission. http://etc.usf.edu/clipart/i/banner.jpg http://etc.usf.edu/clipart/ This website is CoolIris enabled! You can use the CoolIris browser plugin to view the images on this site in an interactive 3D wall.<br><br><br><br> http://www.cooliris.com/ An instrument with straight edges or sides, for drawing lines; a rule.... http://etc.usf.edu/clipart/19500/19589/ruler_19589.htm English ruler with half inch markings.... http://etc.usf.edu/clipart/41600/41626/ruler-half_41626.htm English ruler with inch markings.... http://etc.usf.edu/clipart/41600/41627/ruler_41627.htm Ruler in inches and cm... http://etc.usf.edu/clipart/36400/36459/ruler1_36459.htm Metric ruler.... http://etc.usf.edu/clipart/41600/41624/metric10_41624.htm An illustration of a metric ruler.... http://etc.usf.edu/clipart/48200/48249/48249_metruler.htm English ruler with quarter inch markings.... http://etc.usf.edu/clipart/41600/41625/ruler_quarter_41625.htm Six inch ruler with half inch markings.... http://etc.usf.edu/clipart/41600/41628/ruler6_half_41628.htm Six inch ruler with quarter inch markings.... http://etc.usf.edu/clipart/41600/41629/ruler6_quarter_41629.htm Six inch ruler with inch markings.... http://etc.usf.edu/clipart/41600/41630/ruler6_41630.htm