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stamp tax

(Encyclopedia)stamp tax, method of collecting duties on certain transactions by means of a validating stamp attached to the taxable instrument, which may be a judicial act, a commercial document, a transfer of prop...

periscope

(Encyclopedia)periscope pĕrˈĭskōp [key] [Gr.,=view around], instrument to enable a person to see objects not in his direct line of vision or concealed by some intervening body. Its essential parts are a tube, p...

weather vane

(Encyclopedia)weather vane or wind vane, instrument used to indicate wind direction. It consists of an asymmetrically shaped object, e.g., an arrow or a rooster, mounted at its center of gravity so it can move free...

Morse, Samuel Finley Breese

(Encyclopedia)Morse, Samuel Finley Breese, 1791–1872, American inventor and artist, b. Charlestown, Mass., grad. Yale, 1810. He studied painting in England under Washington Allston and achieved some success. He r...

concerto

(Encyclopedia)concerto kənchârˈtō [key], musical composition usually for an orchestra and a soloist or a group of soloists. In the 16th cent. concertare and concertato implied an ensemble, either vocal or instr...

radiometer

(Encyclopedia)radiometer rāˌdēŏmˈətər [key], instrument for detection or measurement of electromagnetic radiation; the term is applied in particular to devices used to measure infrared radiation. One of the ...

galvanometer

(Encyclopedia)CE5 Galvanometer galvanometer gălˌvənŏmˈətər [key], instrument used to determine the presence, direction, and strength of an electric current in a conductor. All galvanometers are based upo...

Theremin, Leon

(Encyclopedia)Theremin, Leon thĕrˈəmən [key], 1896–1993, Russian engineer and inventor, b. St. Petersburg as Lev Sergeyevich Termen. He studied and worked in his native city, attending its university and cons...

credit, letter of

(Encyclopedia)credit, letter of, commercial instrument through which a bank or other financial institution instructs a correspondent institution to advance a specified sum of money to the bearer. The document is ca...

air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...