Metal was expensive and labor.
Second hinge of the door.
The pivot allows the door to be opened at a 90 degree angle.
A door belongs to the second class of levers because its pivot hinge is at the end the load weight of the door is at the center while the effort opening the door is applied at the other end.
This hinge is installed against the recess in the door where it is impossible to view from the outside.
If each hinge supports half the weight of the door find the magnitude and direction of the horizontal components of the forces exerted by the two hinges on the door.
The first is the pivot and the second is the bracket.
If your right hand is nearer the doorknob then it is a right handed hinge and door.
Hinges have been found in ancient societies in africa asia europe and elsewhere.
However it is seen on interior doors from time to time.
Most of these very early hinges are bronze door hinges.
Akkadian and hittite panache was so great the massive palaces sacred structures and protective gates they built had heavy doors that operated with load bearing metal hinges.
If your left hand is nearer the doorknob then it is a left handed hinge and door.
A wheelbarrow is also a second class lever.