Today I performed a data check on the sea level pressure values calculated from my mercury barometer. During the month of December 2016 I recorded daily values of the mercury barometer sea level pressure and simultaneous National Weather Service values from O'Hare Airport and Midway Airport, near me here in Chicago. The analysis shows that the data from O'Hare averages 1.5 mb higher than from my barometer. The data from Midway averages 2.5 mb higher. Several causes may explain this difference. These are all presented on a new webpage, which may be found under 'Mercury Barometer Data Check', which is under 'Barometric Calculations' on the home page.
Go to 'Mercury Barometer Data Check'.
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Today I added three more aneroid barometers to the website:
I also made minor changes to the web page on printing your own instrument charts. You'll find it on the home page. Have a Happy New Year! Today I added a Belfort Instrument 800A microbarograph to the website. A recent acquisition, it works very well. It was made for the US Government and has the military designation ML-563A/UM on one of the plaques. A very sensitive instrument, a fairly modern design. It may be found under 'Weather Instrument Collection', under 'Microbarographs'.
See Belfort Instrument 800A Microbarograph. Today I added to the website a 1971 catalog from Science Associates of Princeton, New Jersey. They were founded in 1946 and were a distributor of meteorological instruments, rather than a manufacturer. They were suppliers to the US government as well as commercial entities. The 96 page catalog is profusely illustrated and may be found in the 'Weather Instrument Catalog Collection' section, under 'United States'.
Today I added a web page on the US instrument manufacturer Bacharach. While primarily an industrial instrument manufacturer, over the years they manufactured barographs and thermographs (using circular charts) as well as hygrometers, hygrographs, and sling psychrometers. It's in the 'Weather Instrument Catalog' section, under 'United States''.
I also added a Bacharach thermohygrometer and a Bacharach hygrometer to the website. These instruments use a hygroscopic goldbeater's skin membrane to measure relative humidity. Goldbeater's skin is made from cow intestine. Bacharach made these instruments under a patent held by Serdex, Inc. You'll find them at 'Weather Instrument Collection/Hygrometers/Membrane Hygrometers', which is a new category. I received a kind email from K Fischer GmbH today with information regarding Fischer instruments. Using this information I expanded the catalog webpage for Fischer to include their current catalog. I also expanded the instrument page for the Fischer Model 103 barometer. I also posted instrument pages for two additional Fischer instruments I own:
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AuthorI'm Walter, the webmaster and blog moderator Archives
September 2021
CategoriesGo to Home Page.
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