(see diagram Fig. 2). ... and, ifthe chartgivesthe distancein miles of the lightship from the lighthouse, then, by meansofa commonrule of equal parts, we shall be abletomeasure thedistance of the yachtfromthe lighthouse or fromthe lightship.
Title | : | Practical Boat-Sailing: A Concise and Simple Treatise |
Author | : | Douglas Frazar |
Publisher | : | Library of Alexandria - |
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