| The instrument now is an integraph giving the value of a definite integral as function of a variable parameter. |
| The integraph draws the graph of the integral as the user traces the graph of the given function. |
| There is a brake on one of the roughed wheels to check or stop the motion of the integraph when required. |
| Such an instrument is an integraph, and the one I have to describe to you to-night is the outcome of that inquiry. |
| In graphical dynamics the applications of the integraph seem still more numerous. |
| The superiority of the integraph over the integrator cannot be better pointed out than by a concrete example. |
