Use sine principle, the sine regulation from the centre of a long string, accurate calculation of a measured perspective on the edge of the rectangular side, and, accordingly combination of blocks. When the volume to block the group has a high degree of angle for edge to the Sine the elections from the centre of a long string of right triangle, the sine of the face with another right-angled edge (usually flat plane) angle formed by the size of which is measured perspective of the standard value, will be Measuring point of overlap in the work of the sine surface, with micrometer table detection of a measured perspective on the flat surface and the parallel plane, can be obtained measured the angle of error of perspective.

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