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"Hold fast!" cried Tom, as he prepared to press the electrical switch which would set off the guns. Ned and Lieutenant Marbury stood near the indicators to notice how much of the recoil would be neutralized by the check apparatus. "Here we go!" cried the young inventor, and, at the same moment, from down below on the ground, came a warning cry: "Don't shoot, Massa Tom. Don't shoot!
It is also obvious that since some acid or alkali is required to react with the indicator itself, the amount of indicator used should be uniform and not excessive. Usually a few drops of solution will suffice. The foregoing statements with respect to the behavior of indicators present the subject in its simplest terms.
In the following discussion of the principles underlying the behavior of the indicators as a class, methyl orange and phenolphthalein will be taken as types. It has just been pointed out that indicators are bodies of complicated structure. Chem.
He removed his helmet when it reached Terra-normal, but it didn't stop until the indicators showed air pressure, like the gravity, about ten percent greater than Terra's, with a fraction over a quarter oxygen. Like recycled air anywhere, it smelled flat. Finally the inner door cycled open and Tarlac stepped through, to confront what he thought of as a commando squad.
After half an hour that seemed to Justice Higginbotham only a few minutes, so keen had been his absorption in the task, Professor Brierly and Matthews stepped back. Professor Brierly had three cards colored red, green and blue in his hand. He pointed to three indicators that he had connected to wires running from a tube.
As they advanced, the graceful little sand antelope bounded away over the bushes; and above them, soaring high in the cloudless skies, were flights of vultures and huge percnopters, unerring indicators of man's habitation in Somali-land.
But, although such aspects of the heavens were, and always will be, pretty safe and correct indicators of the Weather, they are by no means infallible; and in some regions and under certain conditions they are wanting altogether.
Of sodium and potassium hydroxide, it may be said that they can be used with all indicators, and their solutions may be boiled, but they absorb carbon dioxide readily and attack the glass of bottles, thereby losing strength; sodium carbonate may be weighed directly if its purity is assured, but the presence of carbonic acid from the carbonate is a disadvantage with many indicators; barium hydroxide solutions may be prepared which are entirely free from carbon dioxide, and such solutions immediately show by precipitation any contamination from absorption, but the hydroxide is not freely soluble in water; ammonia does not absorb carbon dioxide as readily as the caustic alkalies, but its solutions cannot be boiled nor can they be used with all indicators.
As it is here in England, so it is with the American Emerson. The fault is not in them, but in the age of which they are no more than the indicators. We are passing out of old forms of activity into others new and on their present scale untried; and how to work nobly in them is the one problem for us all.
Among other applications of the said invention which may be enumerated, it is particularly advantageous for rendering visible clock or watch faces and other indicators such, for example, as compasses and the scales of barometers or thermometers during the night or in dark places during the night time.
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