Media type: E-Article Title: A Model Vernier for Projection Contributor: Heilemann, John J. imprint: American Association of Physics Teachers (AAPT), 1935 Published in: American Journal of Physics Language: English DOI: 10.1119/1.1992928 ISSN: 0002-9505; 1943-2909 Keywords: General Physics and Astronomy Origination: Footnote: