Scarf joint with a projecting tongue (blade) fitting into a housing open on one side in a scarf or rafter apex joint. A secret bridle joint has a bridle invisible from all sides of the timber; identical to mortice and tenon.
see also Bladed Joint
rejected Secret bridle joint
a) Face-halved scarf b) Side-pegging c) Peg d) Face-pegging e) Face
f) Splayed scarf g) Side h) Side-halved i*) Vertical butt j) Face-halved and bladed scarf
k) Squinted butt inside halved scarf l) Undersquinted butt in halved scarf m) Sallied butt
n) Through-splayed and tabled scarf (Trait de Jupiter) p) Side-halved and bridled scarf
q) Stop-splayed scarf r) Key s) Stop-splayed scarf with bridled butts and face key
t) Stop-splayed and tabled scarf with key u) Through-splayed and tabled scarf with face key
v) Stop-splayed and tabled scarf with sallied and undersquinted butt, internal tongues and key
a) Face-halved scarf b) Side-pegging c) Peg d) Face-pegging e) Face
f) Splayed scarf g) Side h) Side-halved i*) Vertical butt j) Face-halved and bladed scarf
k) Squinted butt inside halved scarf l) Undersquinted butt in halved scarf m) Sallied butt
n) Through-splayed and tabled scarf (Trait de Jupiter) p) Side-halved and bridled scarf
q) Stop-splayed scarf r) Key s) Stop-splayed scarf with bridled butts and face key
t) Stop-splayed and tabled scarf with key u) Through-splayed and tabled scarf with face key
v) Stop-splayed and tabled scarf with sallied and undersquinted butt, internal tongues and key
a) Face-halved scarf b) Side-pegging c) Peg d) Face-pegging e) Face
f) Splayed scarf g) Side h) Side-halved i*) Vertical butt j) Face-halved and bladed scarf
k) Squinted butt inside halved scarf l) Undersquinted butt in halved scarf m) Sallied butt
n) Through-splayed and tabled scarf (Trait de Jupiter) p) Side-halved and bridled scarf
q) Stop-splayed scarf r) Key s) Stop-splayed scarf with bridled butts and face key
t) Stop-splayed and tabled scarf with key u) Through-splayed and tabled scarf with face key
v) Stop-splayed and tabled scarf with sallied and undersquinted butt, internal tongues and key