<p><i>Orange Herald (small)</i> warhead prepared for test at the Christmas Island Grapple series on 31 May 1957. Yield was 720 kT.
The spherical implosion device is seen in this photograph housed in the centre section of a <i>Blue Danube</i> carcass with the nose, tail and panelling removed. The 32-lens implosion system can be clearly seen. The firing unit adapted from <i>Blue Danube</i> can be see at the top left attached to the tubular bulkhead, and with 64 cables radiating from it. Each of the 32 firing cables was duplicated.
</p>
<ul><li>Photograph was originally Crown Copyright. This picture had to be taken before the device was detonated in the Christmas Island tests of Spring 1957. Therefore the photograph is now after 50 years out of copyright, and in the public domain. No question of Fair Use applies.</li>
<li>Scanned from the official history and uploaded by <a href="//en.wikipedia.org/w/index.php?title=User:Brian.Burnell&amp;action=edit&amp;redlink=1" class="new" title="User:Brian.Burnell (page does not exist)">Brian.Burnell</a> 23:54, 10 June 2006 (UTC)</li>
<li>Published in the official history:<i>Britain and the H-Bomb</i>.</li>
<li>Author: Lorna Arnold OBE.</li>
<li>Published MacMillan-Palgrave 2001.</li>
<li><style data-mw-deduplicate="TemplateStyles:r1133582631">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><a href="//en.wikipedia.org/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="//en.wikipedia.org/wiki/Special:BookSources/0-312-23518-6" title="Special:BookSources/0-312-23518-6">0-312-23518-6</a> in North America.</li>
<li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1133582631"><a href="//en.wikipedia.org/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="//en.wikipedia.org/wiki/Special:BookSources/0-333-94742-8" title="Special:BookSources/0-333-94742-8">0-333-94742-8</a> elsewhere</li>
<li>No other comparable image exists in the public domain.</li>
<li>Used for the purpose of illustration of an article on British nuclear testing and comparison with other national test programmes.</li>
<li>This image has been published in literature sponsored by the Ministry of Defence for that purpose.</li></ul>