Theater of Machines, Volume II

For this work, it must be quiet and not windy.

perpendicular little weights, as marked from F. to e. on one side. But when one wants to use this water-level instrument, it is necessary that it be completely still, for if the wind blows, the measurement will fail. Therefore, straighten and fasten the little stick of such water-level—marked in the following figure with y.—first straight upright; such little beam should have two supports underneath, like arched corbels or Mutuli projecting blocks, as is marked in the following figure with R. S. Then the instrument of the water-level shall be laid upon the end as marked with T. In such a little beam, a notched spindle should be stuck, as marked with α., which a small wheel might drive around, marked with β. outwards. Upon such spindle, a small string or cord is drawn, fastened from one instrument to the other, as marked in the following figure with S. and M. If you drive such a small wheel around, you may therewith align the instrument straight with the water. In order that the little beam upon which such instrument stands also stands straight upright, you may adjust it through the plumb-weights, directed from the furthest end of both supports, marked with V. X., where such hang at equal distance from one another, as