This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
This is another weak joint, only admissible in the lightest work. The bevelled ends of the side pieces (of a box, for instance) are glued together as for keying, and then a triangular piece is glued inside the corner.
 
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