<i>The Naval Annual</i> of 1887 contained this drawing of the breastwork monitors of the <i>Cerberus</i> class, on Plate 7.
<bdi><a href="https://www.wikidata.org/wiki/Q26985252" class="extiw" title="d:Q26985252"><span title="British naval architect">Frederick Kynaston Barnes</span></a>
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<a rel="nofollow" class="external text" href="https://archive.org/details/brasseysannual00brasgoog">The Naval Annual at archive.org</a>