Index Quotes (5 quotes)
Question: Show how the hypothenuse face of a right-angled prism may be used as a reflector. What connection is there between the refractive index of a medium and the angle at which an emergent ray is totally reflected?
Answer: Any face of any prism may be used as a reflector. The con nexion between the refractive index of a medium and the angle at which an emergent ray does not emerge but is totally reflected is remarkable and not generally known.
Answer: Any face of any prism may be used as a reflector. The con nexion between the refractive index of a medium and the angle at which an emergent ray does not emerge but is totally reflected is remarkable and not generally known.
Genuine student answer* to an Acoustics, Light and Heat paper (1880), Science and Art Department, South Kensington, London, collected by Prof. Oliver Lodge. Quoted in Henry B. Wheatley, Literary Blunders (1893), 182-3, Question 29. (*From a collection in which Answers are not given verbatim et literatim, and some instances may combine several students' blunders.)
A man’s dreams are an index to his greatness.
…...
And from my pillow, looking forth by light
Of moon or favouring stars, I could behold
The antechapel where the statue stood
Of Newton with his prism and silent face,
The marble index of a mind for ever
Voyaging through strange seas of Thought, alone.
Of moon or favouring stars, I could behold
The antechapel where the statue stood
Of Newton with his prism and silent face,
The marble index of a mind for ever
Voyaging through strange seas of Thought, alone.
'Residence at Cambridge', The Prelude, or, Growth of a Poet's Mind: An Autobiographical Poem (1850), Book 3, 57-58.
For terrestrial vertebrates, the climate in the usual meteorological sense of the term would appear to be a reasonable approximation of the conditions of temperature, humidity, radiation, and air movement in which terrestrial vertebrates live. But, in fact, it would be difficult to find any other lay assumption about ecology and natural history which has less general validity. … Most vertebrates are much smaller than man and his domestic animals, and the universe of these small creatures is one of cracks and crevices, holes in logs, dense underbrush, tunnels, and nests—a world where distances are measured in yards rather than miles and where the difference between sunshine and shadow may be the difference between life and death. Actually, climate in the usual sense of the term is little more than a crude index to the physical conditions in which most terrestrial animals live.
From 'Interaction of physiology and behavior under natural conditions', collected in R.I. Bowman (ed.), The Galapagos (1966), 40.
Go to yon tower, where busy science plies
Her vast antennae, feeling through the skies
That little vernier on whose slender lines
The midnight taper trembles as it shines,
A silent index, tracks the planets’ march
In all their wanderings through the ethereal arch;
Tells through the mist where dazzled Mercury burns,
And marks the spot where Uranus returns.
Her vast antennae, feeling through the skies
That little vernier on whose slender lines
The midnight taper trembles as it shines,
A silent index, tracks the planets’ march
In all their wanderings through the ethereal arch;
Tells through the mist where dazzled Mercury burns,
And marks the spot where Uranus returns.
From poem, pronounced to the Boston Mercantile Library Association (14 Oct, 1846), published as Urania: A Rhymed Lesson (1846), 9-10. [Note: This is too often seen online attributed incorrectly to Samuel Pierpont Langley, who quoted several lines from the poem in his New Astronomy (1888), without naming its actual original author. —Webmaster]
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) -- 
