the worlds first known democracy was located at sumer.
the worlds first known democracy was located at sumer.
where was the worlds first known democracy located?
sumer
Na
Na
cap jewels are always paired with hole jewels, and always with a conically shaped pivot. the cap jewels are so called because they "cap" the hole jewels and control the axial movement of the arbor, preventing the shoulder of the pivot contacting the hole jewel. for a properly designed hole and cap jewel system, the arbor pivot bears on the cap jewel as a pin point on a thin film of oil. thus, a hole and cap jewel offer lower friction and better performance across different positions compared with simply a hole jewel.
pocket watch