Definition of Indicator telegraph. Meaning of Indicator telegraph. Synonyms of Indicator telegraph
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Definition of Indicator telegraph
Indicator telegraph 3. (Mech.) The part of an instrument by which an effect is
indicated, as an index or pointer.
4. (Zo["o]l.) 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, trop[ae]olin, 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.