Indicator
['ɪndɪkeɪtə] or ['ɪndɪketɚ]
Definition
(noun.) a device for showing the operating condition of some system.
(noun.) a signal for attracting attention.
(noun.) (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction.
Inputed by Lawrence--From WordNet
Definition
(n.) One who, or that which, shows or points out; as, a fare indicator in a street car.
(n.) 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
(n.) 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).
(n.) A telltale connected with a hoisting machine, to show, at the surface, the position of the cage in the shaft of a mine, etc.
(n.) The part of an instrument by which an effect is indicated, as an index or pointer.
(n.) Any bird of the genus Indicator and allied genera. See Honey guide, under Honey.
(n.) 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.
Checker: Thomas
Examples
- The fraction drum of the indicator could be driven in either direction, known as the advance and retrograde movements, and was divided and marked in eighths. Frank Lewis Dyer. Edison, His Life and Inventions.
- It happened that one day soon after his arrival he was walking through Wall Street and was attracted to the office of the Law Gold Indicator. Rupert S. Holland. Historic Inventions.
- Our first engine compelled the inventing and making of a suitable engine indicator to indicate it--the Tabor. Frank Lewis Dyer. Edison, His Life and Inventions.
- The indicator was composed of several wheels; on the circumference of each wheel were the numerals; and one wheel had fractions. Frank Lewis Dyer. Edison, His Life and Inventions.
- He obtained the desired speed and load with a friction brake; also regulator of speed; but waited for an indicator to verify it. Frank Lewis Dyer. Edison, His Life and Inventions.
- One indicator looked upon the Gold Room; the other opened toward the street. Frank Lewis Dyer. Edison, His Life and Inventions.
- The Gould and Fisk crowd had cornered gold, and had run the quotations up faster than the indicator could follow. Frank Lewis Dyer. Edison, His Life and Inventions.
- The hour glass was another form of time indicator, which was capable of uniform, though extremely limited, action. Various. The Wonder Book of Knowledge.
- Pope, was already active in the same direction, Mr. Callahan, with ready wit, transformed his indicator into a ticker that would make a printed record. Frank Lewis Dyer. Edison, His Life and Inventions.
- The field-regulating apparatus and the electrical-pressure indicator--first of its kind--were also tested, and in turn found satisfactory. Frank Lewis Dyer. Edison, His Life and Inventions.
- It was intended more especially for importers and exchange brokers, and was furnished at a lower price than the indicator service. Frank Lewis Dyer. Edison, His Life and Inventions.
- I went to the indicator, and, having studied it thoroughly, knew where the trouble ought to be, and found it. Frank Lewis Dyer. Edison, His Life and Inventions.
- It was worked somewhat on the plan of the hotel indicator. Rupert S. Holland. Historic Inventions.
- I kept this position, made many improvements, devised several stock tickers, until the Gold & Stock Telegraph Company consolidated with the Gold Indicator Company. Frank Lewis Dyer. Edison, His Life and Inventions.
- Mr. Callahan's first idea was to distribute gold quotations, and to this end he devised an indicator. Frank Lewis Dyer. Edison, His Life and Inventions.
- The indicators or stock-tickers of this company were a new device, and were distributed through most of the large brokerage houses of the city. Rupert S. Holland. Historic Inventions.
- It geared into a unit drum, just as do speed-indicators and cyclometers. Frank Lewis Dyer. Edison, His Life and Inventions.
- Edison's remarks shed a vivid side-light on this extraordinary episode: On Black Friday, he says, we had a very exciting time with the indicators. Frank Lewis Dyer. Edison, His Life and Inventions.
- Later on this primitive indicator was supplanted by the Bradley Bridge, a crude form of the Howell pressure indicators, which were subsequently used for many years in the Edison stations. Frank Lewis Dyer. Edison, His Life and Inventions.
Checker: Wade