{ "item_title" : "The Sumner Line", "item_author" : [" George Cary Comstock "], "item_description" : "The Sumner Line: Or Line Of Position As An Aid To Navigation (1919) is a book written by George Cary Comstock. The book provides a comprehensive guide to using the Sumner Line or Line of Position as a navigational aid. The Sumner Line is a method used to determine a ship's position at sea by using celestial navigation. The book covers the history and development of the Sumner Line, the theory behind it, and practical applications for its use. The author also provides detailed instructions on how to use the Sumner Line, including examples and illustrations. The book is intended for sailors, navigators, and anyone interested in celestial navigation. It is a valuable resource for those who want to learn more about traditional methods of navigation and the history of maritime exploration.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.", "item_img_path" : "https://covers3.booksamillion.com/covers/bam/1/16/507/295/1165072955_b.jpg", "price_data" : { "retail_price" : "20.95", "online_price" : "20.95", "our_price" : "20.95", "club_price" : "20.95", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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