No. 9.

Lack of space prevents any adequate description either of the instruments themselves or of their characteristic properties other than to say that by their aid not only are moments, curves of stability and differential and integral curves, mechanically obtained and with the highest degree of accuracy, but in some instances— notably Coradi's Integraph— the instrument directly plots the curves themselves, making the operation one of automatic graphical integration.

When to these operations are added the immediate mechanical calculation of moments of inertia and gyration, the solution of problems involving the finding of the Centers of gravity, of problems of stability and flotation— in fact of almost every operation occurring in the practice of the Bridge Engineer or Naval Architect the practical value of these instruments is apparent.

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