from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any moth of Pterophorus and allied genera; a plume moth.
from the GNU version of the Collaborative International Dictionary of English
- n. Any moth of the genus Pterophorus and allied genera; a plume moth. See Plume moth, under plume.
The doctrine thus set forth might appear plausible, but it is based on the common misconception that all the force which might be put into the helicopter or 'pterophore' would be utilised for lifting or propelling the vehicle through the air, just as a propeller uses all its power to drive a ship through water.
This single pterophore would lift him vertically, but in order to move horizontally he should be supplied with
The new Daedalus, sitting comfortably in his carriage, would by means of a crank give to the pterophore a suitable circular (or revolving) speed.
When he wished to stop for a little time, valves fixed firmly across the end of the space between the blades would automatically close the openings through which the air flows, and change the pterophore into an unbroken surface which would resist the flow of air and retard the fall of the machine to a considerable degree. '
'It would seem,' says Paucton, 'that in the pterophore, attached vertically to a carriage, the whole built lightly and carefully assembled, he has found something that will give him this result in all perfection.
a 'pterophore,' a name which, so far as can be ascertained, has not been adopted by any other writer or investigator.