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Sentences for "arc "
The rainbow forms an arc in the sky.
Joan of Arc was burned at the stake by the English and their French collaborators.
The 12 streets which radiate out from the Arc de Triomphe in Paris are named after French military leaders.
In May of 1431, Joan of Arc was condemned by an English-dominated church court, and burned at the stake.
To obtain the best results with this type of condenser a powerful illuminant-such as a small arc lamp or an incandescent gas lamp-is needed, together with picked slides of a certain thickness (specified for the[Pg 61] particular make of condenser but generally 1 mm.
(This should be the Liliput Arc Lamp (Leitz), Nernst Lamp or incandescent gas lamp; if either of the two latter are employed, a bull's eye condenser to produce parallel rays must be interposed between light and microscope); and adjust illuminant and microscope so that the substage plane mirror is completely filled with light.
Now, these being the proprieties of every single refracted Ray of light, it will be easie enough to consider what must be the result of very many such Rays collateral: As if we suppose infinite such Rays interjacent between AKSB and ANOB, which arc the terminating: For in this case the Ray AKSB will have its Red triangle intire, as lying next to the dark or quiet medium, but the other side of it BS will have no Blue, because the medium adjacent to it SBO, is mov'd or enlightned, and consequently that light does destroy the colour.
For if we place two black spots each 34 seconds of arc in diameter, near each other, they will not be seen as separate spots unless there is a clear space between them of six times that amount.
If two equal round spots be placed so that the distance between their centres is equal to two diameters, then the diameter of each spot must be, at least, 70 seconds of arc for them to be distinctly defined; that is to say for the spots to be seen as two separate objects.
It is a question of seconds of arc in the one case and of minutes of arc in the other.
If light appears, its antecedent has been impact or friction, condensation or chemical action, and if electricity appears the same sort of antecedents arc present.
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