MIN_FONT_HEIGHT_IN_INCHES = 0.03535;
On a page of 8.5 by 11.5 inches there could be max 122 lines of readable text. So, our estimate would be that maximum line density (6 pt font size) id 122/11.5 lines/inch = 10.60 text lines per inch. Each line takes 1/10.60 of inch = 0.094 inch. This size measure includes space bitween lines as well. Assuming maximum 3/4 standard line spasing the capital letter size of minimal font will be 0.094*3/4 = 0.0707 inch Where lower case character size is half of capital letter 0.0707 /2 = 0.03535 of inch height. Or criteria for selection of characters would be that thier size should be at least 0.03535 inch in any dimension. The minimum line density would be at latrgest font (we pick 48 pts) 48/72 = 0.6666 inch captial