GB 1911 17854 Seckerson
A British patent specification filed by James William Seckerson in 1911 and published in 1912, covering a flying machine, submitted as a draughtsman's drawing for the UK Patent Office and its examiners. The single sheet carries blue-ink line work on yellowed paper: four concentric spirals for rotors arranged around a boxed fuselage plan, thin axis lines, numbered leaders and a hand-inked file number.
