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amplitude analyser angle aperture appear axes axis bands beam become body bright centre circle colours complete components consequently corresponding crystal curve dark depends determined deviation diffraction direction displacement distance disturbance edge effect element emerging energy equal equation ether experiment falls follows fringes give given glass grating half Hence illumination incident increases intensity interference less light matter maximum means measured medium method mirror motion narrow nature normal observed obtained opposite optic ordinary origin parallel passes path pencil period perpendicular phase placed plane plate polarised portion position principal prism produced propagated proportional radius rays reflected refracted represented respectively resultant retardation rings rotation screen seen shows side sin² slit space spectrum substance supposed surface theory thickness thin tion transmitted travels vary velocity vibration violet wave length
Page 18 - Those that are averse from assenting to any new discoveries but such as they can explain by an hypothesis may for the present suppose that, as stones by falling upon water put the water into an undulating motion and all bodies by percussion excite vibrations in the air, so the rays of light...
Page 18 - Stones by falling upon Water put the Water into an undulating Motion, and all Bodies by percussion excite vibrations in the Air, so the Rays of Light, by impinging on any refracting or reflecting Surface, excite vibrations in the refracting or reflecting Medium or Substance, and by exciting them agitate the solid parts of the refracting or reflecting Body, and by agitating them cause...
Page 19 - Is not the heat of the warm room conveyed through the vacuum by the vibrations of a much subtiler medium than air, which, after the air was drawn out remained in the vacuum?
Page 18 - Were I to assume an hypothesis, it should be this, if propounded more generally so as not to determine what light is, further than that it is something or other capable of exciting vibrations in the aether...