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Now throw away the operand NvcH, and we get the velocity equation pure and simple, and the index equation (3) then comes by S= Nv-.

But, altbough the above manipulation of the characteristic equation has some analytical interest, the process cannot be always recommended on the score of simplicity. It is, on the contrary, usually easier and simpler to work upon the component equations upon which the characteristic is founded.

Presents, January 18, 1894.
Transactions.
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.

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