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calculator

(Encyclopedia)calculator or calculating machine, device for performing numerical computations; it may be mechanical, electromechanical, or electronic. The electronic computer is also a calculator but performs other...

digital-to-analog conversion

(Encyclopedia)digital-to-analog or D/A conversion, the process of changing discrete digital data into a continuously varying signal in relation to a standard or reference. There are two types of converters: electro...

lock and key

(Encyclopedia)lock and key, fastening fitted to an entryway, such as a gate or door, or a container, such as a cabinet, drawer or safe, to keep it closed and/or prevent unauthorized access or use. Locks typically c...

Tinguely, Jean

(Encyclopedia)Tinguely, Jean zhäN tăNglēˈ [key], 1925–91, Swiss artist. Tinguely is best known for his “metamechanics,” electromechanical sculptures that perform tasks such as painting or playing music. M...

relay

(Encyclopedia)relay, electromechanical switch operated by a flow of electricity in one circuit and controlling the flow of electricity in another circuit. A relay consists basically of an electromagnet with a soft ...

parimutuel betting

(Encyclopedia)parimutuel betting părˌĭmyo͞oˈtyo͞oĕl [key], system of cooperative wagering invented (c.1870) in France by Pierre Oller. According to the system, the holders of winning tickets divide the total...

Wiener, Norbert

(Encyclopedia)Wiener, Norbert, 1894–1964, American mathematician, educator, and founder of the field of cybernetics, b. Columbia, Mo., grad. Tufts College, 1909, Ph.D. Harvard, 1913. In 1920 he joined the faculty...

W and Z particles

(Encyclopedia)W and Z particles, elementary particles that mediate, or carry, the fundamental force associated with weak interactions. The discovery of the W and Z particles at CERN near Geneva, Switzerland, in the...

Packard, David

(Encyclopedia)Packard, David, 1912–96, American business executive, b. Pueblo, Colo., grad. Stanford (B.A., 1934; M.S., 1939). He and classmate William R. Hewlett opened a garage-based business, which became (193...

Hewlett, William Redington

(Encyclopedia)Hewlett, William Redington hyo͞oˈlĭt [key], 1913–2001, American engineer and business executive, b. Ann Arbor, Mich., grad. Stanford (B.S. 1934, Engineer 1939), Massachusetts Institute of Technol...