{"product_id":"2940157793821","title":"Mechanical Drawing Self-Taught (Illustrated)","description":"The object of this book is to enable the beginner to learn to make\u003cbr\u003esimple mechanical drawings without the aid of an instructor, and to\u003cbr\u003ecreate an interest in the subject by giving examples such as the\u003cbr\u003emachinist meets with in his every-day workshop practice. The plan of\u003cbr\u003erepresenting in many examples the pencil lines, and numbering the order\u003cbr\u003ein which they are marked, the author believes to possess great\u003cbr\u003eadvantages for the learner, since it is the producing of the pencil\u003cbr\u003elines that really proves the study, the inking in being merely a\u003cbr\u003ecurtailed repetition of the pencilling. Similarly when the drawing of a\u003cbr\u003epiece, such, for example, as a fully developed screw thread, is shown\u003cbr\u003efully developed from end to end, even though the pencil lines were all\u003cbr\u003eshown, yet the process of construction will be less clear than if the\u003cbr\u003eprocess of development be shown gradually along the drawing. Thus\u003cbr\u003ebeginning at an end of the example the first pencil lines only may be\u003cbr\u003eshown, and as the pencilling progresses to the right-hand, the\u003cbr\u003edevelopment may progress so that at the other or left-hand end, the\u003cbr\u003efinished inked in and shaded thread may be shown, and between these two\u003cbr\u003eends will be found a part showing each stage of development of the\u003cbr\u003ethread, all the lines being numbered in the order in which they were\u003cbr\u003emarked. This prevents a confusion of lines, and makes it more easy to\u003cbr\u003efollow or to copy the drawing.","brand":"Readings LLC","offers":[{"title":"Default Title","offer_id":47184673865968,"sku":"2940157793821","price":0.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940157793821_p0.jpg?v=1764108957","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940157793821","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}