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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 Corporation in Cambridge, Massachusetts, where he designed and developed measuring instruments, including work on early models of oscilloscopes.


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 [[GR874]] 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]].


==Links==
==Links==
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! Literature link
! Literature link
|-
|-
| 419    || Rectifier-Type Wavemeter      || 1931-11
| [[419]]     || Rectifier-Type Wavemeter      || 1931-11
|-
|-
| 566    || Wavemeter                    || 1931-10
| [[566]]     || Wavemeter                    || 1931-10
|-
|-
| 720    || Heterodyne Frequency Meter    || 1945-07
| [[720]]     || Heterodyne Frequency Meter    || 1945-07
|-
|-
| 758    || Wavemeter                    || 1940-08
| [[758]]     || Wavemeter                    || 1940-08
|-
|-
| 857    || UHF Oscillator                || 1944-11
| [[857]]     || UHF Oscillator                || 1944-11
|-
|-
| 874-MR  || Mixer                        || 1950-05
| [[874-MR]] || Mixer                        || 1950-05
|-
|-
| 1021    || UHF Standard-Signal Generator || 1950-03
| [[1021]]   || UHF Standard-Signal Generator || 1950-03
|-
|-
| 1208    || Unit Oscillator              || 1950-05
| [[1208]]   || Unit Oscillator              || 1950-05
|-
|-
| 1208-B  || Unit Oscillator              || 1954-04  
| [[1208-B]] || Unit Oscillator              || 1954-04  
|-
|-
| 1208-C  || Unit Oscillator              || 1965-06
| [[1208-C]] || Unit Oscillator              || 1965-06
|-
|-
| 1209    || Unit Oscillator              || 1950-05
| [[1209]]   || Unit Oscillator              || 1950-05
|-
|-
| 1209-B  || Unit Oscillator              || 1954-04  
| [[1209-B]] || Unit Oscillator              || 1954-04  
|-
|-
| 1209-C  || Unit Oscillator              || 1965-06
| [[1209-C]] || Unit Oscillator              || 1965-06
|-
|-
| 1218    || Unit Oscillator              || 1955-02
| [[1218]]   || Unit Oscillator              || 1955-02
|-
|-
| 1750    || Sweep Drive                  || 1955-04
| [[1750]]   || Sweep Drive                  || 1955-04
|}
|}


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