THE INTEREST GAUGE
THE INTEREST GAUGE
"We are thinking of calling them 'interest gauges,'" said the agent, "but perhaps you can suggest a better name."
I took one of the little instruments and examined it. Hardly over an inch long, with its glass tube and scale, it resembled a tiny thermometer. The figures and letters were so small that I could not make them out, though they became clear enough through a reading-glass.
"Interest gauges," I remarked, "sounds like something connected with banks. I should think you could find a better name. Who invented them?"
The agent looked important.
"They were invented," he explained, "by Professor Dufunnie, the great psychologist. They are a practical application of psychology. Let me show you how they are used. Allow me—I will take this book—the 'Letters of Junius,' and attach the interest gauge. Here in the back, you see, the gauge is invisible to the reader. You will notice now, if you look through the glass, that the gauge marks zero. No one is reading the book, we have not even opened it, and the human mind is not acting upon the book. If you will take it into your hand, and look down at the gauge through the glass, you will see probably some little agitation of the liquid within the tube. You do, do you not? I thought so. That is because you are probably already familiar, to some extent, with the 'Letters of Junius' and the recollections that they arouse in your mind are exerting themselves upon the fluid. Now, if you will oblige me, open the book and read attentively for a few moments."