https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13994255Edit ImageSaveSaveEditCropCustom TextOptical instruments including Dallmeyer's triplet. Photolithograph by Simonau et Toovey , ca. 1860.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 911 px | 300 dpiLarge JPEG 2888 x 2193 px | 300 dpiFree DownloadOptical instruments including Dallmeyer's triplet. Photolithograph by Simonau et Toovey , ca. 1860.More