For example, we would tend to say that qa is rabatted (rotated) around the axis qd, but notice that conventional rabatment cannot explain the position of plane topl, since it should be rabatted around the line ix in the corporea, and instead it has been rotated around a vertical line passing through d.

Generally the true form of the diagonal is drawn on the half-breadth plan, being obtained by rabatting the plane containing the diagonal about the line through m into the horizontal plane.

The following rule should be noted: In solving the problem of the oblique plane, convert the oblique plane into an inclined plane, and rabat it about its H.T.

Rabat

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