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Published on
Today I scanned and posted a 44 page Essay on Meteorological Observations from 1839 written by Joseph Nicollet, a French scientist.  It was written for the US War Department to aid its officers in collecting weather data.  It may be found in the History of the US National Weather Service under Origins of US Weather Data Collection.

​Go to Origins of US Weather Data Collection webpage.
Published on
Today I posted a number of Friez catalog cut sheets for various instruments, including Biram anemometers, sling psychrometers, and thermometers.  They may be found on the Friez catalog webpage.

​Go to Friez catalog webpage.
Published on
From 1840, a US Army register of meteorological data collected in the 1820s and 1830s at army posts in the US has been added to the website for download.  It may be found on the Home Page by selecting US National Weather Service History, then selecting Origins of US Data Collection.

​Go to Origins of US Data Collection webpage.
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