https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12240172Edit ImageSaveSaveEditCropCustom Text Make it Yours.Edit, remix and personalize with your own textCustomizeOr start from these designsConversion. Copper and brass processing. This sample of brass strip is being tested on a Rockwell Hardness Testing Machine. This test is based upon the depth a steel ball penetrates the metal. A minor load is applied first to hold the ball in position, and then a major load is applied. The dial on the machine measures the depth of the penetration. This test is made to check the physical properties of the metal. Chase Copper and Brass Company, Euclid, Ohio. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1200 x 923 px | 300 dpiLarge JPEG 3500 x 2693 px | 300 dpiBest Quality JPEG 10097 x 7770 px | 300 dpiTIFF 10097 x 7770 px | 300 dpi | 149.64 MBEdit ImageMonthlyYearlySave 50%Get PremiumProfessional design resources and creative toolsfromfrom$6.50/mo$78 billed yearlyUnlimited downloadsAd-free experienceUnlock millions of creative assets and our entire Creative Studio of editable templates, mockups and design toolsBuy Now