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slide rule that using a new principle which is the furniture of cartesian axes and carried out by a mechanical device and is able to calculate instantaneous and without op.of mathematics within the cosine and tangent to the corners or degrees to 360 degrees and vice versa.
slide rule that using a new principle which is the furniture of cartesian axes and carried out by a mechanical device and is able to calculate instantaneous and without op.of mathematics within the cosine and tangent to the corners or degrees to 360 degrees and vice versa.