Verticality Horizontality

 Aim:

Experimental settings of the materials to make a measure

Observation 

Settings using spirit level, plumb line, set square

Production

Slideshow or video showing the experimental settings of the gnomon

Pedagogical module

Set horizontality then verticality with a spirit level

Set verticality with a set square 

Set horizontality of a board with screws, use a spirit level as gnomon

Plumb line as a vertical gnomon