Never mind, Larry urged. Can you get him into the boat, somehow, Jeff? You ought to land him at a hospitalor at the nearest airport. Theres a medical officer at every onefor crack-ups. Or, fly and telephone for help!"Don't touch it," he exclaimed, "keep as far from it as possible. There is real danger here if you only knew it. And whatever you do, don't you go near a soul in the house till you have washed your hands with Sanitas or some pungent disinfectant of that kind. You must be very careful about this."Well, he reflected, its something, now, anyway. We can look for a Frenchmanand learn if theres one named Gaston.Didnt she suspect any trickwas there a trick? CHAPTER VIIIThis brings us back to the old proposition, that for structures which do not involve motion, mathematical data will furnish dimensions; but the same rule will not apply in machinery. To follow the proportions for shafts that would be furnished by pure mathematical data would in nearly all cases lead to error. Experience has demonstrated that for ordinary cases, where power is transmitted and applied with tolerable regularity, a shaft three inches in diameter, making one hundred and fifty revolutions a minute, its bearings three to four diameters in length, and placed ten feet apart, will safely transmit fifty horse-power.
