a transit, a theodolite or a builders level. they are used for laying out curves, building layout lines and wall heights/plumb
This is known as a tiltmeter or inclinometer.
A spirit level.
They had carpenters because they needed the carpenters
They were people who were gold smiths, carpenters, painters, wood workers, wigmakers, musical instrument makers ect.
The Carpenters ended in 1983.
At present there are far more male carpenters than female.
Easy -- hold it at the surface that you want to be level. If the bubble in the glass tube stays in the center where the line is, the surface is level. If not, keep adjusting your work until the bubble stays in the middle. When there are 2 glass tubes and the bubble is not in the same place in both what does that mean? You may have to adjust the work in more than one plane, for example front to back and side to side.
A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical (plumb).
Cooler tools :)
Carpenters - album - was created in 1970.
Carpenters' Hall was created in 1773.
No, carpenters would not use tesselations.