The nezel ring on the base of a lensatic compass is a ratchet device that clicks when turned. It contains how many clicks when rotated fully through 360 degrees and each click is equal to about how many degrees. What is its primary purpose?

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1. The nezel ring on the base of a lensatic compass is a ratchet device that clicks when turned. It contains how many clicks when rotated fully through 360 degrees and each click is equal to about how many degrees. What is its primary purpose?