Today I added a section on calibration and accuracy tests that I have performed on several precision aneroid barometers.  The accuracy of aneroid barometers compared to digital barometers is also presented.  It may be found on the website homepage.

​I also added excerpts from a 1954 WM Welch catalog to the catalog collection, in the US catalog section.

Today I added 8 thermometers from my collection to the website, with photos and descriptions. This includes glass bulb thermometers, bimetallic dial thermometers, and max min thermometers. I will add a few more in a few days.

Gerhard Stoehr of Germany has just published a new book (in German) called "Aneroid-Barometer - die robuste Alternative". It is an illustrated guide to the history, technology, and design of aneroid barometers from 1844 to present. It is softcover and 284 pages with over 500 pictures and illustrations. The price for the book is 69.50 euros plus shipping. DHL shipping to the USA adds 35.99 euros. To order, contact
Stoehr_Vertrieb
D-88499 Riedlingen
Germany
gstoehr (at) t-online.de
​Send your shipping address and your email address. Advance payment by PayPal is required. The book has been added to the website booklist along with another aneroid barometer book authored in 2015 by Ton Meyer. "Aneroide Barometer" presents a barometer collection, is 222 pages, and is in Dutch.

Today I added photos and descriptions of the hygrometers in my instrument collection. This includes wet bulb hygrometers, hair hygrometers, and coil hygrometers. I also added a recent addition to my barometer collection, a Yanagi 8A. Next task is to add the thermometers.
I also added a 15 page excerpt from a 1933 W M Welch catalog showing the meteorological instruments that they supplied. It's in the US instrument catalog section.

Today I posted for download a rare 1905 catalog from Queen & Company of Philadelphia for thermometers and meteorological instruments.  I also added eight aneroid barometers to the instrument collection section, with photos and descriptions.  I will be adding hygrometers and thermometers in the next several days.  Need to finish the history of the US National Weather Service beyond 1970.
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Today I added a meteorological instrument catalog from J H Steward of the UK, undated but probably from the 1930s.  I also added my two mercury barometers to the instrument collection section.  One is a Henry J Green Observatory Barometer in working condition.  The other is a Henry J Green Mountain Barometer from 1885 - 1890 which does not have mercury in it.  I included for download a Microsoft Excel spreadsheet to calculate the local pressure and sea level pressure from mercury barometer data. Comparisons of the mercury barometer measurements with several common digital barometers are also provided.