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Indicator   /ˈɪndəkˌeɪtər/   Listen
noun
Indicator  n.  
1.
One who, or that which, shows or points out; as, a fare indicator in a street car.
2.
(Mach.) A pressure gauge; a water gauge, as for a steam boiler; an apparatus or instrument for showing the working of a machine or moving part; as:
(a)
(Steam Engine) An instrument which draws a diagram showing the varying pressure in the cylinder of an engine or pump at every point of the stroke. It consists of a small cylinder communicating with the engine cylinder and fitted with a piston which the varying pressure drives upward more or less against the resistance of a spring. A lever imparts motion to a pencil which traces the diagram on a card wrapped around a vertical drum which is turned back and forth by a string connected with the piston rod of the engine. See Indicator card (below).
(b)
A telltale connected with a hoisting machine, to show, at the surface, the position of the cage in the shaft of a mine, etc.
3.
(Mech.) The part of an instrument by which an effect is indicated, as an index or pointer.
4.
(Zool.) Any bird of the genus Indicator and allied genera. See Honey guide, under Honey.
5.
(Chem.) That which indicates the condition of acidity, alkalinity, or the deficiency, excess, or sufficiency of a standard reagent, by causing an appearance, disappearance, or change of color, as in titration or volumetric analysis. Note: The common indicators are litmus, tropaeolin, phenol phthalein, potassic permanganate, etc.
Indicator card, the figure drawn by an engine indicator, by means of which the working of the engine can be investigated and its power calculated. The Illustration shows one form of indicator card, from a steam engine, together with scales by which the pressure of the steam above or below that of the atmosphere, corresponding to any position of the engine piston in its stroke, can be measured. Called also indicator diagram.
Indicator telegraph, a telegraph in which the signals are the deflections of a magnetic needle, as in the trans-Atlantic system.





Collaborative International Dictionary of English 0.48


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"Indicator" Quotes from Famous Books



... her her eye caught the jumping indicator, and she smiled a grim smile. "Faith, in two-shilling jumps like that I'll be bankrupt afore I've my hand on the tails of that coat." And with a tired little sigh she leaned back in the corner, closed her eyes, and relaxed her grip on ...
— Seven Miles to Arden • Ruth Sawyer
... said that the voice was nearer the soul than any other expressive part of us. It is certainly a very striking indicator of the state of the soul. If we accustom ourselves to listen to the voices of those about us we detect more and more clearly various qualities of the man or the woman in the voice, and if we grow sensitive to the strain in our own voices and drop it at once when ...
— Nerves and Common Sense • Annie Payson Call
... glancing at the displayed names. He had almost reached the Clerkenwell end of the Garden when his eye was caught by the name of "Austin Wendover, Dealer in Oriental Stones," gleaming in white letters on the blackboard indicator of a set of offices hived in a building on the corner of a side street. It was the name of the man he was searching for. He turned into the passage, and mounted the ...
— The Hand in the Dark • Arthur J. Rees
... into the sea we should never have known what had destroyed us. She was circling round in the hope of dropping a second one, but we shoved on all speed ahead, crammed down the rudders, and vanished into the side of a roller. I kept the deflection indicator falling until I had put fifty good feet of water between the aeroplane and ourselves, for I knew well how deeply they can see under the surface. However, we soon threw her off our track, and when we came to the surface near ...
— Danger! and Other Stories • Arthur Conan Doyle
... got my arms round the very gentlewoman at this moment.' He lowered the end of the coffin he was holding, wiped his face, and throwing a morsel of rotten wood upon another as an indicator, continued: 'That's her husband there. They was as fair a couple as you should see anywhere round about; and a good-hearted pair likewise. Ay, I can mind it, though I was but a chiel at the time. She fell in love with this young man of hers, and their banns were ...
— A Pair of Blue Eyes • Thomas Hardy


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