History: Mortise and Tenon

Source of version: 138 (current)

!History
This is an ancient joint dating back 7,000 years. The first examples, tusked joints, were found in a {MOUSEOVER(label="well near Leipzig")}{img type="fileId" fileId="265" thumb="box" width="400"} Archaeologists in Germany say they've used tree-ring data to identify four ancient water wells as some of the world's oldest timber constructions.
A research team led by the University of Freiburg said the wells excavated at settlements of the first Central European agricultural civilization in the Greater Leipzig region are the oldest known timber constructions in the world, dating to between 5,600 and 4,900 B.C.
Read more: [https://www.upi.com/Oldest-timber-constructions-unearthed/90681356382919/|Oldest Timber Construction Unearthed]{MOUSEOVER} - the world's oldest intact wooden architecture. It has also been found joining the wooden planks of the {MOUSEOVER(label="\"Khufu ship\"" closeDelay="3")}{img fileId="266" thumb="box" align="left"} The Khufu ship is an intact full-size vessel from Ancient Egypt that was sealed into a pit in the Giza pyramid complex at the foot of the Great Pyramid of Giza around 2500 BC. The ship now is preserved in the Giza Solar boat museum. The ship was almost certainly built for Khufu (King Cheops), the second pharaoh of the Fourth Dynasty of the Old Kingdom of Egypt. Like other buried Ancient Egyptian ships, it was apparently part of the extensive grave goods intended for use in the afterlife, and contained no bodies, unlike northern European ship burials. Read more... [https://en.wikipedia.org/wiki/Khufu_ship|Khufu Ship]{MOUSEOVER}, a 43.6 m long vessel sealed into a pit in the Giza pyramid complex of the Fourth Dynasty around 2500 BC. The oldest known use dates from the Early Neolithic Linear Pottery culture, where it was used in the constructing of the wooden lining of water wells.{FOOTNOTE(tag="mt wikipedia")}Wikipedia contributors. "Mortise and tenon." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 22 Oct. 2018. Web. 7 Dec. 2018. {FOOTNOTE}

It has also been found in ancient furniture from archaeological sites in the Middle East, Europe and Asia. Many instances are found, for example, in ruins of houses in the [https://en.wikipedia.org/wiki/Silk_Road|Silk Road kingdom of Cadota], dating from the first to the fourth century BC. In traditional Chinese architecture, wood components, such as beams, brackets, roof frames and struts, were made to interlock with perfect fit, without using fasteners or glues, enabling the wood to expand and contract according to humidity. Archaeological evidence from Chinese sites shows that, by the end of the Neolithic, mortise-and-tenon joinery was employed in Chinese construction.
[https://www.english-heritage.org.uk/visit/places/stonehenge/things-to-do/stone-circle/stones-of-stonehenge/|The thirty sarsen stones of Stonehenge] were dressed and fashioned with mortise-and-tenon joints before they were erected between 2600 and 2400 BC.{footnote sameas="1"}

!!Mortise
The word mortise is derived from the same Latin stem as are the words mortem, mortify, etc., which in turn are suggestive of death. It is supposed that the usual shape of the mortise resembling the shape of the grave gave rise to the origin of the name. Thus the mortise is the hole in one piece of wood into which the tenon fits.

!!Tenon
The word tenon is derived from the Latin teno, to hold. From the same Latin stem words as tenacity, tentacle, etc., are derived. The tenon is the part of a joint of wood which fits into the mortise.

!Types of Mortise and Tenon Joints
!!Mortise
*__Plain or simple__: shoulders on two sides.
*__Blind__: shoulders on three or four sides.
*__Through__: tenon projects through, sometimes pinned,
*__Keyed__: tenon projects through and has wedged shaped key to hold joint tight.
*__Wedged__: where tenon has some form of wedge driven to hold.
*__Open mortise__: a mortise that has only three sides.
*__Stub mortise__: a shallow mortise, the depth of which depends on the size of the timber; also a mortise that does not go through the workpiece (as opposed to a "through mortise").
*__Through mortise__: a mortise that passes entirely through a piece.
*__Wedged half-dovetail__: a mortise in which the back is wider, or taller, than the front, or opening. The space for the wedge initially leaves room to insert the tenon. The wedge, after the tenon is engaged, prevents its withdrawal.
*__Through-wedged half-dovetail__: a wedged half-dovetail mortise that passes entirely through the piece.

!!Tenon
*__Stub tenon__: short, the depth of which depends on the size of the timber; also a tenon that is shorter than the width of the mortised piece so the tenon does not show (as opposed to a "through tenon").
*__Through tenon__: a tenon that passes entirely through the piece of wood it is inserted into, being clearly visible on the back side.
*__Loose tenon__: a tenon that is a separate part of the joint, as opposed to a fixed tenon that is an integral part of one of the pieces to be joined.
*__Biscuit tenon__: a thin oval piece of wood, shaped like a biscuit.
*__Pegged (or pinned) tenon__: the joint is strengthened by driving a peg or dowel pin through one or more holes drilled through mortise side wall and tenon; this is common in timber framing joints
*__Tusk tenon__: a kind of mortise and tenon joint that uses a wedge-shaped key to hold the joint together.
*__Teasel (or teazle) tenon__: a term used for the tenon on top of a jowled or gunstock post, which is typically received by the mortise in the underside of a tie beam. A common element of the English tying joint.
*__Top tenon__: the tenon that occurs on top of a post.
*__Hammer-headed tenon__: a method of forming a tenon joint when the shoulders cannot be tightened with a clamp.
*__Half shoulder tenon__: An asymmetric tenon with a shoulder on one side only. A common use is in framed, ledged and braced doors.

!Examples
{SLIDER(width="800px" height="220px" theme="minimalist-square" expand="y" resizecontents="y" showmultiple="3" buildarrows="y" buildnavigation="y" buildstartstop="y" enablearrows="y" enablenavigation="y" enablestartstop="y" enablekeyboard="y" autoplay="n" pauseonhover="y" animationtime="500" hashtags="n")}{img type="fileId" fileId="258" thumb="box" height="200" desc="A stub tenon corner joint " alt="A stub tenon corner joint "}
///// {img type="fileId" fileId="259" thumb="box" height="200" desc="A haunched stub tenon corner joint " alt="A haunched stub tenon corner joint "}
///// {img type="fileId" fileId="262" thumb="box" height="200" desc="A foxtail wedged tenon joint " alt="A foxtail wedged tenon joint "}
///// {img type="fileId" fileId="260" thumb="box" height="200" desc="A modern feather tenon joint (primarily called a feather tenon)" alt="A modern feather tenon joint (primarily called a loose tenon) "}
///// {img type="fileId" fileId="261" thumb="box" height="200" desc="A traditional through, wedged, mortise and tenon joint " alt="A traditional through, wedged, mortise and tenon joint "}
///// {img type="fileId" fileId="263" thumb="box" height="200" desc="A pinned corner tenon joint " alt="A pinned corner tenon joint "}
{SLIDER}


{img fileId="268"}


!General uses
# Connection between legs and rails, such as in a table.
# Connection between rails with other rails, as in a door.

!Methods of making Mortise and Tenon joint
# __By hand__: Tenons are laid out and sawed. Faces may be chiseled to fit mortise. Rabbeting plane may be used to finish faces of tenons.
# __By machine__: Tenons may be cut with circular saw or tenoner.
# Mortises are made by boring out waste and trimming sides with chisel or by cutting with chisel without boring.
# Mortises are cut with “stab’’ mortiser, chain mortiser or hollow chisel mortiser.

!Images
{img type="fileId" fileId="256" thumb="box" width="200" desc="Blind: shoulders on three or four sides" alt="blind mortise and tenon" featured="y" stylebox="border"}{img type="fileId" fileId="257" thumb="box" height="308" desc="Wedged tenons for the foundation beam of a home in France" alt="wedge tenons for the foundation beam of a home in France" featured="n" stylebox="border"}{img type="fileId" fileId="267" thumb="box" height="292" desc="Mortise and Tenon construction for home building" alt="mortise and tenon construction for home building" featured="n" stylebox="border"}

!Media
{youtube movie="https://youtu.be/aBodzmUGtdw"}

!File References
{files fileId="258:259:262:260:261:263:268:256:257:267" showaction="y" showicon="y" showfilename="n" showdescription="y" showlasteditor="n"}

!References
{footnotearea}

{showreference showtitle="yes" hlevel="1"}
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History: Mortise and Tenon

Source of version: 138 (current)

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