Analog Weather Blog - Analog Weather

Published on: December 31, 2016

Mercury Barometer Data Check

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'.

Published on: December 29, 2016

More Aneroid Barometers...

Today I added three more aneroid barometers to the website:

An Airguide desk barometer made by Fee & Stemwedel of the US. I think it's from the 1940s, it has an attractive hardwood case. Performance is mediocre.
A GMP laboratory barometer from 1957 from the USSR. I think GMP means Gidromet Pribor, or Hydrometeorology Instrument. It still works pretty well.
A Takahashi marine barometer from Japan. I think it's from 1960. Works fairly well.

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!

Published on: December 28, 2016

Belfort 800A Microbarograph

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.

Published on: December 27, 2016

Science Associates

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'.

Published on: December 17, 2016

Bacharach

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.

Published on: December 15, 2016

Fischer

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:

A Model 111 Hair Hygrometer
A Model 118 Polymeter

Thank you, Fischer, for the information.

Published on: December 14, 2016

1878 Instructions to Observers

Today I scanned and added the 1878 manual 'Instructions to Observers Connected with the Meteorological Service of the Dominion of Canada'. It's 212 pages and is in the 'Miscellaneous Downloads' section of the website under 'Obsrvation Manuals'. Tomorrow I may add a few hygrometers to the instrument collection section.

Published on: December 12, 2016

More Aneroid Barometers

Today I added a large Utsuki Keiki barometer and a Safonovsky Gidrometpribor M-67 barometer to the instrument collection section of the website. Both are in good working condition. For the month of December, I'm measuring the accuracy of 16 different aneroid barometers on a daily basis by comparing them with readings from my Henry J Green mercury Fortin barometer. The results will be added to the website in early January.

Published on: December 8, 2016

A J Dodge/Charles Wilder

Today I added a web page on thermometer and barometer manufacturers A J Dodge and Charles Wilder of Petersborough, New Hampshire. They were in business from 1860 to 1933. It's in the catalog section of the website, under US catalogs. As of now it just has historical information, if anyone has a catalog please contact me.

Go to A J Dodge/Charles Wilder catalog page.

Published on: December 2, 2016

More Thermometers

Today I added four more thermometers to the instrument collection section of the website. Three are glass bulb thermometers:

An A J Dodge Thermometer
A Palmer Marine Thermometer
A US Army Signal Corps ML-7 Thermometer.

One is a bimetallic dial thermometer:

A Tel-Tru/Germanow-Simon Room Thermometer

I also added a catalog page for Palmer Thermometers, though I don't have any vintage catalogs yet. In the next few days I will add several more thermometers and hygrometers.