Henry P. Hall
Henry Parsons Hall (June 28, 1928 - July 17, 2023) graduated from Williams College in 1949 and MIT in 1952 before joining General Radio as a co-op student in 1949.
He then worked for close to forty years for the same company until his retirement from GenRad in 1993 as a staff scientist.
He is credited with the design of the Digibridge instrument and invented the Orthonull mechanism (see 1650-A).
Hall was a Life Fellow of the IEEE and one of only three General Radio Fellows.
please expand bio
Links
- IET Labs Application Note, Henry Hall: Father of the Digibridge
- A New System for Measuring the Inductance of Iron-Core Coils. GenRad Experimenter Vol.36 No.5, May 1962 (1630-A, 1633-A)
- The Measurement of Electrolytic Capacitors. GenRad Experimenter Vol.40 No.6, June 1966 (1617-A)
Patents
- US Patent 2872639, Henry P Hall, Electrical bridge and method. Filed Oct. 10, 1956; Granted Feb. 3, 1959 (describing the Orthonull feature)
- US Patent 4342089, Henry P Hall, Method of and apparatus for automatic measurement of circuit parameters with microprocessor calculation techniques. Filed Dec 12, 1979; Granted July 27, 1982 (→ 1657)
- please extend list of patents
Instruments
| Instrument | Description | Literature link |
|---|---|---|
| 1206-B | Unit Amplifier | 1953-11 GE |
| 1212-P2 | One-Megacycle Filter | 1956-01 GE |
| 1232-P2 | Preamplifier | 1967-02 GE |
| 1265-A | Adjustable DC Power Supply | 1962-05 GE |
| 1417 | Four-Terminal Capacitance Standard | 1978 catalog |
| 1426 | Four-Terminal Capacitance Standard | 1968-01 GE |
| 1433 | Decade Resistors | 1968-11 GE |
| 1434 | Decade Resistors | 1965-10 GE |
| 1455 | Decade Voltage Dividers | 1967-04 GE |
| 1605 | Impedance Comparator | 1954-04 GE |
| 1608 | Impedance Bridge | 1962-03 GE |
| 1613-A | Capacitance Bridge | 1958-02 GE |
| 1617-A | Capacitance Bridge | 1966-06 GE |
| 1633 | Incremental Inductance Bridge | 1962-05 GE |
| 1644 | Megohm Bridge | 1964-07 GE |
| 1650-A | Impedance Bridge | 1959-03 GE |
| 1656 | Impedance Bridge | 1970-03 GE |
| 1657 | Digibridge | 1976 |
| 1658 | Digibridge | 1976 |
| 1666 | Resistance Bridge | 1972 Autumn GR Today |
| 1685 | Digital Impedance Meter | 1973 |
| 1686-A | Digital Capacitance Meter | |
| 1687 | 1 MHz Digibridge | |
| 1688 | Precision LC Digibridge | |
| 1689 | Precision Digibridge | |
| 1862-C | Megohmmeter | 1963-07 GE |
| 1863-A | Megohmmeter (Inspection model) | 1969-03/04 GE |
| 1864-A | Megohmmeter (Laboratory model) | 1969-03/04 GE |