In the last few days I posted an interesting pamphlet from 1885 called "Corrections of Thermometers".  It was published by the US Signal Service.  It's located under 'Miscellaneous Downloads' on the 'Thermometer Downloads' page.

I also added numerous links to aid in navigation of the site.  Most pages have a link back to the home page. The instrument collection pages have links to the instrument catalog pages.

In the next several days I plan to add several aneroid barometers to the instrument collection section.  I will update the barometer calibration analysis at the end of September.