British Patent "Specification of Matthew Piers Watt Boulton : A.D. 1868, 5th February. No 392. : Aärial Locomotion &amp;c.", London: Great Seal Patent Office, printed by George E. Eyre and William Spottiswoode, 1868.
<bdi><a href="https://en.wikipedia.org/wiki/en:Matthew_Piers_Watt_Boulton" class="extiw" title="w:en:Matthew Piers Watt Boulton"><span title="British classicist (1820–1894)">Matthew Piers Watt Boulton</span></a>
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2014-07-23 11:00:00
"Specification of Matthew Piers Watt Boulton : A.D. 1868, 5th February. No 392. : Aärial Locomotion &amp;c.", London: Great Seal Patent Office, printed by George E. Eyre and William Spottiswoode, 1868.  Obtained via the Seattle Museum of Flight on digital media; thence transferred to gustavewhitehead.com, from where it was downloaded.  Originally published in the U.K. in 1868 as a patent, based on a paper published in 1864.