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Mr W B Hardy and Flight Lieutenant J K Hardy
Mr W B Hardy on the Spreading of Fluids on Glass
Prof F Allen on the Persistence of Vision of Colours
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acid actual angle appear applied atomic calculated capacity chemical clean colour complete composite considered constant corresponding curves definite depends described determined direction displacement distance drop effect electric electron energy equal equation evidence experiments expression faces fact field film fluid follows force formula frequency function further give given glass greater increase indicated integral intensity layer length light limit lines lubricant matter means measured method molecules negative normal noted observed obtained original oscillations pass Phil placed plane plate positive possible present pressure probably produced range region represent resonance respectively responders seen separation shown solid solution sparking potential steady surface surface tension Table taken temperature theory thickness tube unit varied vector vibrations wave-length waves whole wires write