{ "item_title" : "Thacher's Calculating Instrument", "item_author" : [" Edwin Thacher "], "item_description" : "Thacher's Calculating Instrument: Or Cylindrical Slide-Rule (1884) is a book written by Edwin Thacher. The book is a comprehensive guide to the cylindrical slide-rule, a tool used for mathematical calculations. Thacher's Calculating Instrument provides detailed instructions on how to use the slide-rule, including how to perform addition, subtraction, multiplication, and division. The book also includes examples and exercises to help readers practice using the slide-rule. Additionally, Thacher provides historical background on the development of the slide-rule and its use in various fields, such as engineering and navigation. Thacher's Calculating Instrument is a valuable resource for anyone interested in the history of mathematics or the practical application of mathematical tools.Containing Complete And Simple Rules And Directions For Performing The Greatest Variety Of Useful Calculations With Unexampled Rapidity And Accuracy.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://covers4.booksamillion.com/covers/bam/1/12/072/107/1120721075_b.jpg", "price_data" : { "retail_price" : "19.95", "online_price" : "19.95", "our_price" : "19.95", "club_price" : "19.95", "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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