Old Methane Gas Cloud
Join Date: Jun 2009
Location: Huntington Beach, California
First, the joint is probably cut by hand using a chisel.
Second the joint is probably used in frames for true divided light applications in French doors. (With a bunch of small glass panes not one large pane of glass.)
Today there are router bits that make the functionality of the joint possible with power tools. I've seen examples of true divided light and simulated divided light router bit sets.
Use the right tool for the job.
Rich (Tilting right)
Huntington Beach, California
Remember that when we have the "BIG ONE" everything east of the Rockies falls into the ocean.