Table of Contents

Introduction Chapter 1 A Short History Astrolabe Latitude Hook Quadrant Cross Staff Back Staff Sextant Chapter 2 Elements of the Sextant and Four Vital Adjustments Perpendicularity Frame and Index Mirror Frame and Horizon Glass Parallelism Index Mirror and Horizon Glass Telescope and Frame Adjustment Procedures Chapter 3 Attachments and Accessories Astigmatizers Double Star Prism Wide View Horizon Glass Davis Prism Level Bubble Horizon Attachment Neck Straps Visual Aids Chapter 4 Care, Maintenance, and Repair Oiling and Cleaning Immersion Bath Procedures How to Hold Where to Put Down Mounted Sextant Boxes Emergency Silvering Techniques Applying Paint Resilvering Horizon Glass Chapter 5 How to Buy a Sextant Where to Find Them Prices Five Ground Rules to Avoid Problems Taking Test Sights Interstellar Test Table Discovering the Dropped Sextant Reconditioning Costs Chapter 6 Sighting Techniques Inversion for Location Precalculating Azimuths Rocking or Swinging an Arc Sun's Upper Limb Shades for Sun, Moon, and Venus Correcting for False Horizon Rough Weather Sighting Techniques Making a Monocle Chapter 7 Correcting the Sight The Thirteen Errors Correcting for Moon, Venus, and Mars Correcting for Wave Height Chapter 8 Timing the Sight Accurately The Hack Watch Using a Tape Recorder Counting Paces and Stopwatches Attaching Stopwatch to Sextant Chapter 9 Searching for Stars The Necessity for Preplanning Finding Sunrise Using the Rude Star Finder Converting Local Time Using H.O. Pub. No. 249 Making and Using a Wrist Board Chapter 10 Sextants of Tomorrow Is the Sextant Doomed? Coming Developments Appendixes A--Sextant Check Procedures B--Sextant Manufacturers C--Distribution and Dealers D--The Navigator's Basic Tool Kit E--Making and Using an Artificial Horizon F--Table of Interstellar Angles for Practice Sighting and Sextant Testing G--Useful Addresses Bibliography Index

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