Walter Guyton Cady

Walter G. CadyWalter Cady
Dr. Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer.wikipedia
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Crystal oscillator

crystalquartz oscillatorquartz crystal
He was a pioneer in piezoelectricity, and in 1921 developed the first quartz crystal oscillator.
Paul Langevin first investigated quartz resonators for use in sonar during World War I. The first crystal-controlled oscillator, using a crystal of Rochelle salt, was built in 1917 and patented in 1918 by Alexander M. Nicholson at Bell Telephone Laboratories, although his priority was disputed by Walter Guyton Cady.

Crystal filter

quartz crystalquartz crystal filter
Cady held more than 50 patents, and was the inventor of the crystal-controlled oscillator, the highly selective narrow-band crystal filter, one of the principal theorists of the ferroelectricity in crystals, and a historian of the science of piezoelectric crystals.
The design concept for utilizing quartz crystals as a filtering component was first established by Walter Cady in 1922, but it was largely Warren P. Mason's work in the late 1920s and early 1930s that devised methods for incorporating crystals into LC lattice filter networks which set the groundwork for much of the progress in telephone communications.

IEEE Morris N. Liebmann Memorial Award

IRE Morris N. Liebmann Memorial AwardIEEE 1986 Morris N. Liebmann AwardIRE Morris N. Liebmann Award
He won the 1928 IEEE Morris N. Liebmann Memorial Award, and in 1936 was the second American to receive the Duddell Medal and Prize of the Physical Society of London.
1928 - W. G. Cady

Physics

physicistphysicalphysicists
Dr. Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer.

Electrical engineering

electrical engineerelectricalelectrical engineers
Dr. Walter Guyton Cady (December 10, 1874 – December 9, 1974) was a noted American physicist and electrical engineer.

Piezoelectricity

piezoelectricpiezoelectric effectpiezo-electric
He was a pioneer in piezoelectricity, and in 1921 developed the first quartz crystal oscillator.

Providence, Rhode Island

ProvidenceProvidence, RIProvidence, R.I.
Cady was born in Providence, Rhode Island, graduated from Brown University in 1895, and studied 1897-1900 at the University of Berlin, receiving his Ph.D. in Physics in 1900.

Brown University

BrownCollege in the English Colony of Rhode Island and Providence PlantationsCollege of Rhode Island and Providence Plantations
Cady was born in Providence, Rhode Island, graduated from Brown University in 1895, and studied 1897-1900 at the University of Berlin, receiving his Ph.D. in Physics in 1900.

Humboldt University of Berlin

BerlinUniversity of BerlinHumboldt University
Cady was born in Providence, Rhode Island, graduated from Brown University in 1895, and studied 1897-1900 at the University of Berlin, receiving his Ph.D. in Physics in 1900.

U.S. National Geodetic Survey

U.S. Coast and Geodetic SurveyCoast SurveyU.S. Coast Survey
(From 1895-1897 he was also instructor in mathematics at Brown.) He was a Magnetic Observer from 1900-1902 with the Coast and Geodetic Survey, and from 1902-1946 he was a professor of physics at Wesleyan University, where his principal interests included electrical discharges in gases, piezoelectricity, ultrasound, piezoelectric resonators and oscillators, and crystal devices.

Wesleyan University

WesleyanWesleyan (CT)Cardinals
(From 1895-1897 he was also instructor in mathematics at Brown.) He was a Magnetic Observer from 1900-1902 with the Coast and Geodetic Survey, and from 1902-1946 he was a professor of physics at Wesleyan University, where his principal interests included electrical discharges in gases, piezoelectricity, ultrasound, piezoelectric resonators and oscillators, and crystal devices.

Ultrasound

ultrasonicultrasonicsultrasounds
(From 1895-1897 he was also instructor in mathematics at Brown.) He was a Magnetic Observer from 1900-1902 with the Coast and Geodetic Survey, and from 1902-1946 he was a professor of physics at Wesleyan University, where his principal interests included electrical discharges in gases, piezoelectricity, ultrasound, piezoelectric resonators and oscillators, and crystal devices.

World War I

First World WarGreat WarFirst
Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines.

General Electric Company

GECGeneral ElectricGeneral Electric Co. Ltd.
Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines.

Columbia University

ColumbiaColumbia CollegeColumbia University President
Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines.

New London, Connecticut

New LondonNew London, CTNew London, Conn.
Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines.

Submarine

submarinesdiesel-electric submarinediesel-electric
Before World War I, Cady investigated arc discharges and radio detectors, but during the war became interested in crystals as he worked with General Electric Company's Research Laboratory, Columbia University, and the Naval Experimental Station in New London, Connecticut, on using high-frequency sound generated by piezoelectricity to detect submarines.

Potassium sodium tartrate

Rochelle saltSeignette crystal
His early experiments employed Rochelle salt crystals as transducers.

Frequency standard

frequency referencestandardstandard frequencies
Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States.

Institute of Radio Engineers

IREBritish Institute for Radio EngineersI.R.E.
Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States.

Italy

🇮🇹ItalianITA
Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States.

France

🇫🇷FrenchFRA
Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States.

England

🏴󠁧󠁢󠁥󠁮󠁧󠁿󠁧󠁢󠁥󠁮󠁧󠁿EnglishENG
Cady quickly realized that such circuits could be used as frequency standards, in 1922 published an IRE paper on this application, and in 1923 made the first direct international comparison of frequency standards by comparing his quartz resonators with frequency standards in Italy, France, England, and the United States.

Radar

radar stationradarsradar system
During World War II, Cady again worked on military applications of piezoelectricity, including trainers for radar operators that used piezoelectric transducers in liquid tanks to generate realistic radar returns.

Pasadena, California

PasadenaPasadena, CACity of Pasadena
He retired to Pasadena, California, in 1951, where he was a Research Associate at Caltech.