A contemporary plan of a tunnel boring machine from the 1880s on an idea by Colonel Frederick Beaumont and Thomas English. The tunnel boring machine was 9 meters (30 ft) long and was driven with compressed air.
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Der Kanaltunnel - Fakten und Zahlen, 1994, S. 22/23 uploaded by <a href="//commons.wikimedia.org/wiki/User:Opihuck" title="User:Opihuck">Opihuck</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Opihuck" title="User talk:Opihuck"><span class="signature-talk">talk</span></a>)