- Employ the elliptic coordinates n,, and -=n+Vi, such that z=cch?, cchncos,y=cshnsin-; (1) then the curves for which n and are constant are confocal ellipses and hyperbolas, and -d(n,) =c 2 (ch 2 n - cost) = 2c 2 (ch2n-cos2) = r i r 2 = OD 2, (2) if OD is the semi-diameter conjugate to OP, and ri, r 2 the focal distances, rl,r2 = c (ch n cos 0; r 2 = x2 +y2 = c 2 (ch 2 n - sin20 = 1c 2 (ch 2 7 7 +cos 2?). [Please select]
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Nothing is more natural to drunken men than ellipses. [Please select]
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All young parts of stems are continually moving in circles or ellipses. [Please select]
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A stick smouldering at one end and waved about in circles and ellipses is not dangerous when elders are by, but it is dangerous if played with on the sly. [Please select]
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What model has the Megachile when cutting her neat ellipses out of the delicate material for her wallets, the robinia-leaves. [Please select]
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