Henry P. Hall

Henry P. Hall (1966)

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
• please extend list of patents

Instruments

Instrument	Description	Literature link
1206-B	Unit Amplifier	1953-11
1212-P2	One-Megacycle Filter	1956-01
1232-P2	Preamplifier	1967-02
1265-A	Adjustable DC Power Supply	1962-05
1417	Four-Terminal Capacitance Standard	1978 catalog
1426	Four-Terminal Capacitance Standard	1968-01
1433	Decade Resistors	1968-11
1434	Decade Resistors	1965-10
1455	Decade Voltage Dividers	1967-04
1605	Impedance Comparator	1954-04
1608	Impedance Bridge	1962-03
1613-A	Capacitance Bridge	1958-02
1617-A	Capacitance Bridge	1966-06
1633	Incremental Inductance Bridge	1962-05
1644	Megohm Bridge	1964-07
1650-A	Impedance Bridge	1959-03
1656	Impedance Bridge	1970-03
1862-C	Megohmmeter	1963-07
1863-A	Megohmmeter	1969-03
1864-A	Megohmmeter	1969-03