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Learn How to Use a Compass and Never Get Lost Again

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Nature

Mode of Masking or Cutting off Sharply the Light from Revolving Apparatus on any Desired Compass-Bearing by means of a Reciprocating Screen

OWING to the optical properties of the lens employed in revolving lights, a formidable element of difficulty comes in the way of effecting a sharp cut-off on a particular bearing; for the direction of ...
Outside

Learn How to Use a Compass and Never Get Lost Again

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