English: Photo of 36 Johansson gauge blocks wrung together and held horizontally, from a 1907 toolmaking book. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong that it easily supports their weight. Caption of photo: "Thirty-six gages wrung together and held horizontally". Alterations to image: removed caption, increased brightness.
Public domain in USA - published in USA prior to 1923
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{{Information |Description={{en|1=Photo of 36 Johansson Wikipedia:gauge blocks wrung together and held horizontally, from a 1907 toolmaking book. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong