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'.

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.

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.

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.

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.

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.

Today I added a web page for the Russian meteorological instrument manufacturer Safonovsky Gidrometpribor.  It's in the 'Weather Instrument Catalog Collection' section of the home page, under 'Russia'.  I also added a page for a Safonovsky Gidrometpribor BAMM-1 barometer in the 'Weather Instrument Collection' section of the home page, under 'Aneroid Barometers'.  Unfortunately the barometer is not functional.

For the 27 aneroid barometers in my collection, I calculated and tabulated the readability of the pressure scales.  By readability I mean the number of millibars per centimeter of pressure scale on the outermost scale of the barometer.  I added a page to the website with a table of the readability values and the barometers ranked from most readable to least readable.  Not surprisingly, the largest barometers were most readable, while the least readable was a pocket altimeter.  The table is found on the page 'Aneroid Barometer Readability' under ' Barometric Calculations, Calibration, and Accuracy' on the Home Page.

Go to Readability Table.