Construction of a telescope:
More terms will be added throughout the duration of the project.
[French : une séchée]. When grinding the tool against the blank glass disk, with a wet abrasive (carbo) in between, the grains of the abrasive get eroded, mix with particles of glass, and eventually form a grey mud that tends to dry out. At this point, the process of grinding is stopped in order to rince both tool and mirror and replace the abrasive. This is called a wet.