JUST as “one shove of the bayonet” was truly said to be more effective than any number of learned discussions on the art of war:— this really practical work, giving genuine quaternion solutions of new problems as well as largely extended developments of old ones, is of incomparably greater interest and usefulness than the recently renewed, but necessarily futile, attempts to prove that a unit vector cannot possibly be a quadrantal versor:—nay, that a Calculus of Vectors must limit itself to the beggarly elements of addition and subtraction, commonly called “composition.”

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DOI

https://doi.org/10.1038/049193a0

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