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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



... paradoxical law which says, that whenever a man self-centred, thinking of, living for and in himself, is very desirous for place, for preferment, for honor, the very fact of his being thus is of itself a sufficient indicator that he is too small to have them, and mankind refuses to accord them. While the one who forgets self, and who, losing sight of these things, makes it his chief aim in life to help, to aid, and to serve others, by this very fact makes it known that he is large enough, is ...
— What All The World's A-Seeking • Ralph Waldo Trine
... the doctor's office a few moments before in obedience to the invitation sank into a luxurious chair. The doctor looked at him casually, and, touching an indicator at the side of his ...
— Best Short Stories • Various
... of the vast building he knew that she would smile and kiss him, that the baby would laugh and climb gaily upon his knee, and he knew that he would not have to tell her that he had failed to find the coveted employment. His face would be the indicator, and, beneath her first smile of welcome, he could always distinguish the searching glance of anxiety; under her warm kiss he could ...
— Her Weight in Gold • George Barr McCutcheon
... But even its importance was overshadowed. Miko stood in the center of the radio room, triumphantly reading the little indicator. Its beam swung on the scale, which chanced to be almost directly over Anita's head. I saw Miko's expression change.... A look of surprise, amazement, ...
— Brigands of the Moon • Ray Cummings
... palm of one dimpled hand, she went out to the kitchen, found an apron, and began drawing the water for dinner and dropping Marna's mayonnaise on the salad. She must, however, have been sitting for several minutes in the baby's high chair, staring unseeingly at the wall, when the buzzing of the indicator brought her ...
— The Precipice • Elia Wilkinson Peattie


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