Dovetail joint box work. It offers the strength found in the dovetail joint but is totally hidden from both outside faces by forming the outer edge to meet at a 45-degree angle while hiding the dovetails internally within the joint. The mitred corner dovetail joint is very similar in design, but it has just a single dovetail and is used for picture frames and other similar joins. The secret double-lapped dovetail is similar to the secret mitred dovetail, but presents a very thin section of end grain on one edge of the joint. Used for carcass and box construction to hide the
Mitre the end of the 18th century, due to changes in military fashion, the mitre had generally given way to the bearskin or had been replaced by the standard infantry tricorn or bicorn. The British Army made this change in 1765 and the Prussian Army in 1790. All Russian grenadiers continued however to wear mitre caps until 1805, even when on active service. The mitre in its classic metal-fronted 18th century form survived as an item of ceremonial parade dress in the Prussian "Leib-Grenadier No 1" and "1st Garde-Regiment zu Fuss" regiments, plus the Russian Pavlovskii Regiment, until World War I.