The Monthly Microscopical JournalVolume 9, Issue 2 p. 51-53 On an Aërial Stage Micrometer: an improved form of engraved “Lens-Micrometer” for Huyghenian Eye-pieces, and on finding Micrometrically the Focal Length of Eye-pieces and Objectives G. W. Royston-Pigott M.A., M.D., &c., G. W. Royston-Pigott M.A., M.D., &c.Search for more papers by this author G. W. Royston-Pigott M.A., M.D., &c., G. W. Royston-Pigott M.A., M.D., &c.Search for more papers by this author First published: February 1873 https://doi.org/10.1111/j.1365-2818.1873.tb02236.xRead the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Volume9, Issue2February 1873Pages 51-53 RelatedInformation