Eduard Karplus: Difference between revisions

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'''Eduard Karplus''' (September 7, 1899 – August ?, 1979) was an Austrian-born engineer, best known as the inventor of the [[Variac]].
{{Person
|Names=Eduard Karplus
|Birth date=September 7, 1899
|Birth place=Hinterbrühl, Austria
|Death date=1 August 1979
|Death place=Belmont, MA, US
|Countries=
|Affiliations=Vienna University of Technology, C. Lorenz AG, General Radio
|Wikidata id=Q22018784
}} was an Austrian-born engineer, best known as the inventor of the [[Variac]].


Karplus was born in Hinterbrühl, Austria, the second child of Johann Paul Karplus, a neurophysiologist and psychiatrist, and Valerie von Lieben, a sister of physicist Robert von Lieben.
Karplus was born in [[wikipedia:Hinterbrühl|Hinterbrühl, Austria]], the second child of Johann Paul Karplus, a neurophysiologist and psychiatrist, and Valerie von Lieben, a sister of physicist [[wikipedia:Robert von Lieben|Robert von Lieben]].


He graduated from the Vienna University of Technology in 1923.  From 1923 to 1929, he was employed in the RF laboratories of C. Lorenz AG, Berlin, Germany, where he worked on mobile high-frequency communication equipment.
He graduated from Vienna University of Technology in 1923.  From 1923 to 1929, he was employed in the RF laboratories of [[wikipedia:C. Lorenz AG|C. Lorenz AG]], Berlin, Germany, where he worked on mobile high-frequency communication equipment.


In 1930, Eduard Karplus joined the engineering staff of General Radio Corporation in Cambridge, Massachusetts, where he designed and developed measuring instruments, including work on early models of oscilloscopes.
In 1930, Eduard Karplus joined the engineering staff of [[General Radio|General Radio Corporation]] in Cambridge, Massachusetts, where he designed and developed measuring instruments, including work on early models of oscilloscopes.
In 1938, he became a Fellow of the IRE.


Karplus' best-known invention is the development of the first practical, continuously adjustable variable-ratio autotransformer, which General Radio introduced under the "Variac" brand name (short for "variable AC") in 1933. In the 1940s and 1950, Karplus continued to work on microwave topics such as signal generators, including the design of the [[GR-874 connector|GR-874 hermaphroditic high-frequency connector]].
Karplus' best-known invention is the development of the first practical, continuously adjustable variable-ratio autotransformer, which General Radio introduced under the "[[Variac]]" brand name (short for "variable AC") in 1933.  
 
In the 1940s and 1950, Karplus continued to work on microwave topics such as signal generators, including the design of the [[GR-874 connector|GR-874 hermaphroditic high-frequency connector]].
 
[https://www.worldradiohistory.com/Archive-IRE/60s/IRE-Directory-1960-Members.pdf IRE Directory 1960]:
:KARPLUS, Eduard (A'31-F'38), Engineer, General Radio Company, 22 Baker Ave., West Concord, Mass.
:Born: September 7, 1899, Moedling, Austria. Ingenieur, 1923, Technische Hochschule, Vienna, Austria.  


==Links==
==Links==
* [https://en.wikipedia.org/wiki/Eduard_Karplus Eduard Karplus] @ Wikipedia
* [https://en.wikipedia.org/wiki/Eduard_Karplus Eduard Karplus] @ Wikipedia
* [https://www.ietlabs.com/pdf/GR_Experimenters/1931/GenRad_Experimenter_May_1931.pdf Eduard Karplus, ''Electron Oscillations''. General Radio Experimenter, Vol.5 No.12 May 1931, p.1] (on Barkhausen-Kurz oscillations)
==Patents==
* [https://patents.google.com/patent/US1856709A/en US Patent 1856709, Eduard Karplus, ''Coupling arrangement for compensated high frequency amplifiers'']. Filed 1928-01-09; Granted 1932-05-03
* [https://patents.google.com/patent/US1811357A/en US Patent 1811357, Eduard Karplus, ''Wireless signaling apparatus'']. Filed 1929-03-11; Granted 1931-06-23
* [https://patents.google.com/patent/US1916224A/en US Patent 1916224, Eduard Karplus, ''Self-contained oscillator tube'']. Filed 1929-12-09; Granted 1933-07-04
* [https://patents.google.com/patent/US2009013A/en US Patent 2009013, Eduard Karplus, ''Alternating-current apparatus'']. Filed 1934-06-01; Granted 1935-07-23  (the [[Variac]] patent)
* [https://patents.google.com/patent/US2367681A/en US Patent 2367681, Eduard Karplus, ''Ultra-high-frequency tuning apparatus'']. Filed 1941-12-10; Granted 1945-01-23
* [https://patents.google.com/patent/US2578429A/en US Patent 2578429, Eduard Karplus, ''Ultrahigh-frequency tuning apparatus'']. Filed 1945-12-19; Granted 1951-12-11


==Instruments==
==Instruments==
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! Literature link
! Literature link
|-
|-
| [[419]]     || Rectifier-Type Wavemeter      || 1931-11
| [[419-A]]   || Rectifier-Type Wavemeter      || 1931-11
|-
|-
| [[566]]     || Wavemeter                    || 1931-10
| [[566-A]]   || Wavemeter                    || 1931-10
|-
|-
| [[720]]     || Heterodyne Frequency Meter    || 1945-07
| [[687-A]]   || Oscilloscope                  || 1934 ([https://www.ietlabs.com/genrad_history/genrad_museum GR Museum])
|-
|-
| [[758]]     || Wavemeter                    || 1940-08
| [[720-A]]   || Heterodyne Frequency Meter    || 1945-07
|-
|-
| [[857]]     || UHF Oscillator                || 1944-11
| [[758-A]]  || Wavemeter                    || 1940-08
|-
| [[857-A]]   || UHF Oscillator                || 1944-11
|-
|-
| [[874-MR]]  || Mixer                        || 1950-05
| [[874-MR]]  || Mixer                        || 1950-05
|-
|-
| [[1021]]   || UHF Standard-Signal Generator || 1950-03
| [[1021-A]] || UHF Standard-Signal Generator || 1950-03
|-
| [[1025-A]]  || Swept Frequency Generator    || 1963-01
|-
|-
| [[1208]]   || Unit Oscillator              || 1950-05
| [[1208-A]] || Unit Oscillator              || 1950-05
|-
|-
| [[1208-B]]  || Unit Oscillator              || 1954-04  
| [[1208-B]]  || Unit Oscillator              || 1954-04  
Line 39: Line 68:
| [[1208-C]]  || Unit Oscillator              || 1965-06
| [[1208-C]]  || Unit Oscillator              || 1965-06
|-
|-
| [[1209]]   || Unit Oscillator              || 1950-05
| [[1209-A]] || Unit Oscillator              || 1950-05
|-
|-
| [[1209-B]]  || Unit Oscillator              || 1954-04  
| [[1209-B]]  || Unit Oscillator              || 1954-04  
Line 45: Line 74:
| [[1209-C]]  || Unit Oscillator              || 1965-06
| [[1209-C]]  || Unit Oscillator              || 1965-06
|-
|-
| [[1218]]   || Unit Oscillator              || 1955-02
| [[1218-A]] || Unit Oscillator              || 1955-02
|-
|-
| [[1750]]   || Sweep Drive                  || 1955-04
| [[1750-A]] || Sweep Drive                  || 1955-04
|}
|}


[[Category:General Radio people]]
[[Category:General Radio people]]

Latest revision as of 20:03, 25 July 2024

Eduard Karplus (b. September 7, 1899 in Hinterbrühl, Austria – d. 1 August 1979 in Belmont, MA, US) (→ WikiData) was an Austrian-born engineer, best known as the inventor of the Variac.

Karplus was born in Hinterbrühl, Austria, the second child of Johann Paul Karplus, a neurophysiologist and psychiatrist, and Valerie von Lieben, a sister of physicist Robert von Lieben.

He graduated from Vienna University of Technology in 1923. From 1923 to 1929, he was employed in the RF laboratories of C. Lorenz AG, Berlin, Germany, where he worked on mobile high-frequency communication equipment.

In 1930, Eduard Karplus joined the engineering staff of General Radio Corporation in Cambridge, Massachusetts, where he designed and developed measuring instruments, including work on early models of oscilloscopes. In 1938, he became a Fellow of the IRE.

Karplus' best-known invention is the development of the first practical, continuously adjustable variable-ratio autotransformer, which General Radio introduced under the "Variac" brand name (short for "variable AC") in 1933.

In the 1940s and 1950, Karplus continued to work on microwave topics such as signal generators, including the design of the GR-874 hermaphroditic high-frequency connector.

IRE Directory 1960:

KARPLUS, Eduard (A'31-F'38), Engineer, General Radio Company, 22 Baker Ave., West Concord, Mass.
Born: September 7, 1899, Moedling, Austria. Ingenieur, 1923, Technische Hochschule, Vienna, Austria.

Links

Patents

Instruments

Instrument Description Literature link
419-A Rectifier-Type Wavemeter 1931-11
566-A Wavemeter 1931-10
687-A Oscilloscope 1934 (GR Museum)
720-A Heterodyne Frequency Meter 1945-07
758-A Wavemeter 1940-08
857-A UHF Oscillator 1944-11
874-MR Mixer 1950-05
1021-A UHF Standard-Signal Generator 1950-03
1025-A Swept Frequency Generator 1963-01
1208-A Unit Oscillator 1950-05
1208-B Unit Oscillator 1954-04
1208-C Unit Oscillator 1965-06
1209-A Unit Oscillator 1950-05
1209-B Unit Oscillator 1954-04
1209-C Unit Oscillator 1965-06
1218-A Unit Oscillator 1955-02
1750-A Sweep Drive 1955-04
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