Today I scanned and posted a 15 page excerpt from the 1940 WM Welch catalog showing the meteorological equipment they supplied.  It is available for download at the following location:
Go to W M Welch Catalog Page

A 180 page catalog from the instrument supplier Weathertronics has been added to the website for download as a PDF.  It may be found on the Weather Measure/Weathertronics page in the catalog collection.
Go to Weather Measure/Weathertronics catalog page.

Today I posted four documents on the website, available for download:

1. An 1860 catalog from the UK instrument manufacturer L. Casella.  See Casella Catalogs.
2. The original 1852 edition of Guyot's Meteorological Tables.  See Reference Document Downloads.
3. The 1905 edition of the US Weather Bureau's Instructions for Sunshine Recorders, Circular G by C F Marvin.  It's on a new pyranometer download webpage.  See Pyranometer Downloads.
4. The 1923 edition of the same manual, also on the pyranometer download page.

Today I added several instrument documents to the website for download.  These included:

• The 1893 US Weather Bureau publication "Anemometry" by Charles F Marvin.  See Anemometry Download webpage.
• A set of 1860 instructions for the James Green mercury barometer published by the Smithsonian.  See Mercury Barometer Download webpage.
• Three manuals on measurements with rain gauges:

1. The 1893 US Weather Bureau publication "Instructions for Use of the Rain-Gauge"
2. The 1913 US Weather Bureau publication "Measurement of Precipitation" by Charles F Marvin.
3. A later 1922 edition of this USWB publication by Benjamin Kadel.  See the new Rain Guage Document webpage.

Today I added 10 documents to Miscellaneous Downloads section of the website, too numerous to list here.  To explore, go to Miscellaneous Downloads.

Today I posted numerous documents related to barometers, both aneroid and mercury.  I also divided the barometer download web page into separate web pages for general barometer documents, aneroid documents, and mercury documents, as the page was getting too large.

Go to Barometer Document Download Page.

Today I added two mercury barometers to the instrument collection on the website:

1. A Fortin barometer made by James Green & Henry J Green, from around 1879 to 1885.  J Green & H J Green were partners in this period.  It is not functioning, there's no mercury in it.  See now.
2. A Fortin barometer made by W M Welch around 1949.  It also is not functioning, there is no mercury in it.  See now.

​I also revised the text for the Henry J Green mercury barometers already on the website.

Today I posted two Ohio Thermometer catalogs, one from 1947 and the other, I believe, from the 1950s.  They may be found under Catalog Collection/United States/Ohio Thermometer.

Go to Ohio Thermometer catalog page.

A website visitor from Switzerland pointed out that I incorrectly had listed Thermindex as a German company, when it in fact was Swiss.  I have moved the Thermindex catalog page to be listed under Switzerland in the catalog collection, and have added more information on Thermindex and a thermometer photograph.

​Go to Thermindex catalog page.

I added several documents to the website in the last several days, including the following:

1. From the 1800s, a 2 page article on filling barometer tubes by James Green was added, under Miscellaneous Downloads/Instrument Downloads/Barometer Downloads.  See now.
2. From 1889, a US Signal Service booklet "The Temperature of the Dew Point, Relative Humidity, and Vapor Pressure was added under Miscellaneous Downloads/Instrument Downloads/Hygrometer Downloads.  It's 27 pages.  See now.
3. From 1961, the US Weather Bureau booklet "The Instrumental Program of the US Weather Bureau" was added under Miscellaneous Downloads/General Instrument Downloads.  Its 17 pages.  See now.
4. From 1857, the booklet "The History and Use of the Barometer" by Lum Woodruff was added under Miscellaneous Downloads/Instrument Downloads/Barometer Downloads.  It's 16 pages.  See now.
5. From 1896, the US Weather Bureau booklet ""Wind Signals for Displaymen" was added under Miscellaneous Downloads/Instrument Downloads/Anemometer Downloads.  It's 11 pages.  See now.