Metal was expensive and labor.
Second hinge of the door.
This hinge is not as common as some of the other types.
The first is the pivot and the second is the bracket.
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.
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 right hand is nearer the doorknob then it is a right handed hinge and door.
This hinge is installed against the recess in the door where it is impossible to view from the outside.
If your left hand is nearer the doorknob then it is a left handed hinge and door.
However it is seen on interior doors from time to time.
Hinges have been found in ancient societies in africa asia europe and elsewhere.
A wheelbarrow is also a second class lever.
The pivot allows the door to be opened at a 90 degree angle.
Most of these very early hinges are bronze door hinges.