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This done, he looked at the depth indicator; it registered seventy feet; but, before he could determine the speed of descent, there came a shock that permeated the whole boat. They were on the bottom. "And Lord only knows," groaned Ross, "how much we've taken in! But it's only three atmospheres, thank God. Here, you," he commanded to the nerveless Foster, who had again found a seat.
The hand of this indicator is, of course, set by the officer before the bomb is released either from a gun or from tracks along the deck. Then there have been a number of tricks; some of them Yankee tricks, some of them the creatures of the equally fruitful British tar. One day in the North Sea a British patrol-vessel came across a trawler.
Suppose the air pressure indicator has the scale divided into quarter pound marks. This will make it accurate enough for all purposes.
Were it not for our turn and bank indicators, our altimeter and air speed instruments, and our navigational instruments, it would be impossible to tell by looking at least, though we could tell by our shifting weight whether we were upside down or right side up, on one wing or on an even keel. It's eery. We wouldn't be able to tell whether we were moving were it not for our air speed indicator.
There are certain general experiments intended to show the use of measuring instruments which all students must perform. To illustrate the use of the indicator I have selected an elementary class, although the instrument is equally applicable to all classes of experiments. Having selected a suitable room, tables may be placed against the walls between the windows and at other convenient places.
For it was not the wing itself but the force of the eddying currents of air that had sent him whirling away from the monster. With the indicator at zero the magnetic currents and the opposing powers of attraction and repulsion were so evenly balanced that any violent atmospheric disturbance affected him in the same way that thistledown is affected by a summer breeze.
If I keep on as I am I shall be sure to reach land of some sort, in time, and when I wish to return home I can set the indicator to the northwest and that will take me directly back to Boston." This was good reasoning, but the rash youth had no idea he was speeding over the ocean, or that he was destined to arrive shortly at the barbarous island of Brava, off the coast of Africa.
A pencil, p, with a knife hinge, is inserted into the piston rod, at e, and the point of the pencil bears upon the surface of the paper wound upon the drum A. If the drum A did not revolve, this pencil would merely trace on the paper a vertical line; but as the drum A moves round and back again every stroke of the engine, and as the pencil moves up and down again every stroke of the engine, the combined movements trace upon the paper a species of rectangle, which is called an indicator diagram; and the nature of this diagram determines the nature of the engine's performance.
When the fish is struck the point is drawn from the socket, while the shaft acts as a cheek on, and an indicator of, its course when just below the surface. Occasionally the HIBISCUS TILLIACEUS is laid under tribute for ropes and lines, which, however, are not considered as durable as those from the fig. Nets, set and hand, are also made with twine from the fig or hibiscus.
"You may go," ordered Long, and, as his man left, he moved over closer to the switchboard. He was listening eagerly and also watching an indicator that told the numbers of the rooms which called, as they flashed into view. Just as a call from "509" flashed up, Long slipped the rings off his little fingers and loosened the white rats on the telephone switchboard itself.
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