{"product_id":"2940013298941","title":"Test Apparatus for Measuring Sound Power Levels of Drills","description":"This Bureau of Mines report describes in detail the design and operation of a test apparatus for measuring the sound power levels of drills used by the mining industry. The two major components of the test apparatus are a computer-controlled automated drill test fixture (adtf) and a 45,000-ft3 reverberation chamber that houses the adtf. Design specifications and performance capabilities of the adtf and the reverberation room are given. Initial test results for three types of drills - a pneumatic percussion drill, a hydraulic percussion drill, and a pneumatic rotary drill - are given to illustrate the types of experiments that can be conducted with the test apparatus.","brand":"1001 Property Solutions LLC","offers":[{"title":"Default Title","offer_id":47082561732848,"sku":"2940013298941","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940013298941_p0.jpg?v=1763590706","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940013298941","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}