An easily constructed nonmagnetic lightweight device consisting of a small plane surface to which two movable arms are attached has been successfully used to form the true dip plane where only apparent dips are available. Measurement of strike and dip with a Brunton compass using the surface of the device as the true dip surface eliminates additional measurement as well as all calculations. It is also useful where bedding planes are too small to make readings on, as well as on hard rock where only bedding traces are visible. The device has proved to be exceptionally useful where many measurements of cross-strata were required.

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