These tac diagrams are available on this webpage (in PDF format) for download and printing at full size.  Just right click and select "Save as..."  Use these diagrams as teaching tools or as chair flying aids.  If you have diagrams that you find useful for teaching a topic, send it to me.  I'll redraw it (if necessary) and post it here.

On a side note, all the diagram here are ones that I have drawn.  I've essentially tried to recreate diagrams that I had collected from other sources.  Unfortunately they were copies of copies and the fidelity had degraded so far that further reproductions would make them unusable.  That said, there may be mistakes.  If you see any, let me know.  It's relatively easy to fix.