For marking out jobs using height gauges, squares etc, it's a precise flat surface (though it is worn I think and needing reconditioned) use it for checking flatness of things and blueing high spots when scraping surfaces, and for butchering sheep.what do you use it for?
Edit... I thought you meant the table.
Straight edge is used for marking the high spots when scraping surfaces flat, like the worn ways of the the slot cutter that it's sat on. Apply a thin film of marking medium on to the straight edge (or on to the work piece) and the high spots show up where they contact.
I'm still learning...
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