Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 64
Root, Rule. Extract the Square Root of the number as before described, and ofthat root extract the Square Root again, then the last is the Fourth root ofthe number. Example 9. Required the fourth root of 2469781 ? <§/ 2469781 = V ]/2469781 = yl571*4463 = 39*6467, the answer.To find tlie Sixth… … All calculations in this Pocket Book have been computed by this Instrument.It consists of a silvered brass plate on which are fixed two moveable arms, ex-tending from the centre to the periphery. On the plate are engraved a numberof curved lines in such form and divisions, that by their…
Mechanical engineering · Engineering
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