Treatise on ascertaining the levelness of surfaces
Scope & Content:
A short anonymous treatise on the construction and use of an instrument called the 'pipe (الأنبوبة; see f. 29v, line 7)', which functions similarly to a spirit level to ascertain the levelness of a surface. There is a diagram of the instrument on f. 30v. The 'tube (الأنبوبة)' is suspended from ...
