An engraving <i>(rotated 90° clockwise)</i> showing the parts of a cannon, from the page facing page 25 of John Roberts' <i>The Compleat Cannoniere</i> (1652).
Unknown author<span style="display: none;">Unknown author</span>. Book authored by John Roberts 1652; image scanned by <a href="//commons.wikimedia.org/wiki/User:Dr_Steven_Plunkett" title="User:Dr Steven Plunkett">Dr Steven Plunkett (Steven J. Plunkett)</a>.
Scanned from an original copy of <cite class="book" style="font-style:normal">John Roberts, of Weston (1639)      <i> The compleat cannoniere: or, The gunners guide: Wherein are set forth exactly the chiefe grounds and principals of the whole art, in a very briefe and compendious forme, never by any set forth in the like nature before. With divers excellent conclusions, both arithmeticall and geometricall belonging thereunto: as also sundry serviceable fireworkes, both for sea and land service. A study delightfull and very usefull for men of the best quality, and imbrac'd by the greatest princes. Written by Iohn Roberts of <a href="https://en.wikipedia.org/wiki/Weston,_Bath" class="extiw" title="w:Weston, Bath">Weston</a> neere <a href="https://en.wikipedia.org/wiki/Bath,_Somerset" class="extiw" title="w:Bath, Somerset">Bathe</a>, Gentleman, practitioner and professor in the arte thereof</i>, <a href="https://en.wikipedia.org/wiki/en:London" class="extiw" title="w:en:London"><span title="capital and largest city of the United Kingdom">London</span></a>:  Printed by J. Okes, and are to be sold by George Hurlock at his shop in <a href="https://en.wikipedia.org/wiki/Thames_Street,_London" class="extiw" title="w:Thames Street, London">Thames-street</a> neere <a href="https://en.wikipedia.org/wiki/St_Magnus-the-Martyr" class="extiw" title="w:St Magnus-the-Martyr">S. Magnus Church</a>  <small><a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/837630348">837630348</a>. </small></cite> (From the private collection of <a href="//commons.wikimedia.org/wiki/User:Dr_Steven_Plunkett" title="User:Dr Steven Plunkett">Steven J. Plunkett</a>.)