Each of these rings was four feet in diameter, and secured in the wall by a stone tenon of corresponding dimensions.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens
In addition the tenon saw was generally backed in iron and the sash saw in brass.
"Woodworking Tools 1600-1900"
Peter C. Welsh
2766 represents the mortice and tenon, the thickness of the tenon being one-third that at C, which leaves a thickness at E and D equal to that of the tenon.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose