Need help with these two vintage instruments - Page 1
Forum section: electronics / general

author: 1audio
author_rank: Frequent Contributor
timestamp: March 29, 2025, 09:10:00 pm
content: There are from a period when I was collecting bridges with 6+ knobs. Any information about them would be helpful.First is this RG Resonance Bridge. Clearly quite old (frequency on Megacycles)I have not opened it up. Shows its years of benign neglect.Second is the Honeywell (rubicon?) Potentiometer. I can find nothing on these. "Honeywell potentiometer" gets pots. Rubicon gets vintage stuff in wood boxes. This has knobs galore.Any info or interest would be appreciated.

author: guenthert
author_rank: Frequent Contributor
timestamp: April 05, 2025, 08:25:13 am
content: Such old manuals will be hard to find on-line (I'm astonished that one occasionally succeeds at all). The Leeds & Northrup potentiometers (e.g. the 7556 guarded potentiometer) seem to have been more popular; for such one can find some information. I expect them to be similar, so their documentation might be of help in understanding yours.

author: Overspeed
author_rank: Frequent Contributor
timestamp: April 06, 2025, 07:14:43 am
content: HelloSome history of the Honeywell company1954 Honeywell purchased Heiland Research Corp. which becomes Test Instruments and Photo Division in Denver , CO .1954 Honeywell Research developed a germanium power transistor and the Transistor Division is formed in Minneapolis, MN. An early start in solid state electronics which failed to blossom.1955 A joint venture with Raytheon was formed called Datamatic Corp. and was Honeywell's entry into the computer business. The company's first computer system, the D-1000, weighed 25 tons, took up 6,000 square feet and cost $1.5 million.1956 Sperry's Aeronautical Division moved to Phoenix, AZ and became Sperry Phoenix Co.1957 Sperry Phoenix moved into the 19th Ave. and Deer Valley facility in Phoenix, AZ.1960 Raytheon's share of the business was bought out and the EDP Division of Honeywell was formed.1964 The company name was shortened from Minneapolis-Honeywell Heat Regulator Co. to Honeywell, Inc.1965 Development and production of the Apollo Control System began at Honeywell Aero Division.1966 Sperry Phoenix became Sperry Flight Systems.1967 Honeywell sales exceeded $1 billion.1969 Honeywell became the first supplier of digital avionics to commercial airliners with the Flight Computer for the McDonnell Douglas DC-10.1970 Honeywell bought General Electric's computer business to form Honeywell Information Systems Division (HIS).1974 Honeywell purchased the Process Control Computer business from GE which later became the current Process Solutions Division of Honeywell located in Phoenix, AZ.1980 Sperry Flight Systems reorganized forming the Commercial Division, Defense Division and Space Systems Division.Don t look as a commercial instrument but look as a in house product , perhaps custom made for company purpose , good luck to locate the documentation.Honeywell had also a production of instrument as the potentiometer mod 2730 , 2745 ...RegardsOS

author: 1audio
author_rank: Frequent Contributor
timestamp: April 08, 2025, 08:17:19 pm
content: Interesting. No mentuion of Rubicon. The Resistor I just contributed to the cal club was branded Honeywell Rubicon. I'm sure it was a small part of Honeywell.