{"product_id":"2940016548418","title":"A Brief Treatise on Pantograph Design","description":"A pantograph is a simple mechanical device used to reduce and enlarge figures or images.  A pantograph can be hold a pen or a variety of cutting and engraving tools, and can be used by artists engravers in a variety of applications.\u003cbr\u003e\u003cbr\u003eThis treatise uses simple language to explain the mathematics of reducing and enlarging pantographs, and seeks to fill in what many how-to guides do not as it explores the features that make a functional pantograph and assists the hobbyist with designing their own machine.","brand":"Tim's Technical Books","offers":[{"title":"Default Title","offer_id":47101455925488,"sku":"2940016548418","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940016548418_p0.jpg?v=1763637714","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940016548418","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}