Guideline and layout ruler for calligraphers

A layout ruler comprising:

• an elongated first longitudinal member having an upwardly facing surface bearing a first set of graduation indicia spaced therealong;
• elongated ruler insert means in parallel laterally spaced relation to said first longitudinal member, said ruler means having an upwardly facing surface bearing a second set of graduation indicia space therealong;
• an elongated second longitudinal member defining a channel to slidably receive said ruler insert means, both said longitudinal members have inner sidewalls which face each other to define a central guideway therebetween, each of said walls defining a longitudinal groove;
• a cross frame member which extends between said longitudinal members and retains said longitudinal members in spaced parallel relationship;
• an elongated lateral straightedge member having a straight scribing edge;
• attachment means slidably connecting one end of said straightedge member to said first longitudinal member for movement of said straightedge member in a direction parallel to the longitudinal axis of said first longitudinal member and for maintaining said straightedge at a fixed angle relative to said axis, said attachment means including a central member slidably retained in said guideway by opposed tongues which extend outwardly from said central member and are received by said grooves;
• and
• locking means for detachably retaining said central member in a fixed position relative to said longitudinal members, said locking means including means for securing said ruler against a flat supporting surface, a threaded shaft received by a vertical threaded opening through said central member, a foot at the end of said shaft nearest said supporting surface, and a control knob at the other end of said shaft for rotating said shaft to move said foot vertically between positions in and out of contact with said supporting surface.