{"title":"Hartley Amasa Calkins","description":"\u003cp\u003eDelve into the works of Hartley Amasa Calkins, a prolific voice offering insightful perspectives. Discover compelling narratives that explore social themes. Start your exploration of his thought-provoking books today.\u003c\/p\u003e","products":[{"product_id":"abney-level-handbook-book-hartley-amasa-calkins-9781396318382","title":"The Abney Level Handbook","description":"\u003cp\u003eThis book teaches you everything about one of the most useful and lesser-known surveying instruments.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eInvented in the 1870s, the Abney level grew popular in the 20th century and is still in use today by foresters, surveyors, geologists, and safety inspectors.\u003c\/p\u003e\u003cp\u003eNext to the compass, the Abney is probably the most essential and popular surveying instrument in use in the Forest Service.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eIt's considered as a clinometer mainly used in surveying rugged lands and forests. And it's favored over other tools due to its convenient size, ease of operation, and relative precision.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eThe book is full of illustrations, displaying how to operate the Abney level for beginners and how to optimize it for experienced workers. It also details its common usages and how to best carry them out. So whether you're a field worker who wants to have an edge with a handy tool or an engineer who wants to know their way around the production workshop, this book will prove invaluable \u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eThe numerous activities to which it is adapted, its stability and simplicity of design, its ease and speed of manipulation, and the relatively high precision that is so readily obtained by the careful and experienced operator have made this instrument a favorite of all practical field men who have had an opportunity to give it a thorough trial.\u003c\/p\u003e","brand":"WoB","offers":[{"title":"- \/ - \/ -","offer_id":51024318267665,"sku":"","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"US \/ NEW \/ INGRAM","offer_id":51024320659729,"sku":"NIN9781396318382","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"GB \/ NEW \/ INGRAM","offer_id":52586695000337,"sku":"NLS9781396318382","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1396318380.jpg?v=1750986873"},{"product_id":"abney-level-handbook-book-hartley-amasa-calkins-9781789870503","title":"The Abney Level Handbook","description":"\u003cp\u003e\u003cstrong\u003eThis official handbook of the U.S. Forest Service explains how to use the Abney hand level, a clinometer tool used to measure angles in various natural environments.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe Abney tool was invented by William de Wiveleslie Abney, an English astronomer, during the 1870s. By the time the device was recognized and widely-used in the early 20\u003csup\u003eth\u003c\/sup\u003e century, it had been refined. Though earlier guides cover its basic usage, this U.S. government commissioned handbook offer exhaustive demonstration and instruction on the tool's abilities. The authors - Hartley Calkins and Y. B. Yule - were themselves experienced reconnaissance surveyors with ample experience traversing and measuring the rugged woodland landscapes of North America.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe Abney level is used to this day by land surveyors, geologists, foresters, and safety inspectors; in good hands, it is reliable for its accuracy. At roughly $60-100 in price it is affordable, durable, lightweight and - being handheld - portable. The Abney Level Handbook, first published in 1927 and expanded in 1935, remains the authoritative source simply as it covers the subject exhaustively well. This edition faithfully reproduces the words and instructions given, and includes all of the diagrams, graphs, drawings and charts present in the 1935 version.\u003c\/p\u003e","brand":"WoB","offers":[{"title":"US \/ NEW \/ INGRAM","offer_id":51050554949905,"sku":"NIN9781789870503","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"US \/ VERY_GOOD \/ SBYB","offer_id":53142233055505,"sku":"CIN178987050XVG","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/178987050X.jpg?v=1750801993"},{"product_id":"abney-level-handbook-how-to-use-the-topographic-abney-hand-level-clinometer-tool-book-hartley-amasa-calkins-9780359742974","title":"The Abney Level Handbook: How to Use the Topographic Abney Hand Level \/ Clinometer Tool – A Guide for the Experienced and Beginners, Complete with Diagrams \u0026 Charts (Hardcover)","description":null,"brand":"WoB","offers":[{"title":"- \/ - \/ -","offer_id":51157216067857,"sku":"","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"GB \/ NEW \/ GARDNERS","offer_id":51157218918673,"sku":"NGR9780359742974","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/0359742971.jpg?v=1751228404"},{"product_id":"abney-level-handbook-how-to-use-the-topographic-abney-hand-level-clinometer-tool-book-hartley-amasa-calkins-9780359742967","title":"The Abney Level Handbook: How to Use the Topographic Abney Hand Level \/ Clinometer Tool – A Guide for the Experienced and Beginners, Complete with Diagrams \u0026 Charts","description":null,"brand":"WoB","offers":[{"title":"US \/ NEW \/ INGRAM","offer_id":53522965135633,"sku":"NIN9780359742967","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/9780359742967.jpg?v=1778460725"}],"url":"https:\/\/www.worldofbooks.com\/collections\/author-books-by-hartley-amasa-calkins.oembed","provider":"World of Books ","version":"1.0","type":"link"}