Plan diagram showing <a href="https://en.wikipedia.org/wiki/1-inch_Nordenfelt_gun" class="extiw" title="en:1-inch Nordenfelt gun">1-inch 4-barrel Nordenfelt gun</a>.<br><p>For description on terms see :
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<ul><li><a href="//commons.wikimedia.org/wiki/File:1_inch_4_barrel_Nordenfelt_Mark_III_nomenclature.jpg" title="File:1 inch 4 barrel Nordenfelt Mark III nomenclature.jpg">File:1 inch 4 barrel Nordenfelt Mark III nomenclature.jpg</a></li></ul>
Admiralty, UK
<a rel="nofollow" class="external text" href="http://handle.slv.vic.gov.au/10381/303771">Handbook for the 1" 4-barrel Nordenfelt gun : 1886</a>