Today I added a Lambrecht Polymeter to the instrument collection on the website.  I believe it dates from the early 1900s but I could be wrong.  Lambrecht made polymeters from around 1893 until at least the 1980s.  However this polymeter has a dial face almost the same as one shown in the 1913 Eimer & Amend catalog available on this website.  It has a mercury thermometer, beveled glass, and an old-looking dial face.  Newer Lambrecht polymeters had silvered faces.

​See Lambrecht Polymeter.

Today I added a Naudet marine barometer to the website.  I call it a marine barometer because I bought it from the ship breakers in India, it might actually be a laboratory barometer, it has no means of wall mounting.  I suspect it dates from the 1980s.

See Naudet marine barometer.

I also added a 1903 Eimer & Amend catalog excerpt to the catalog collection on the website.  It contains a few thermometers, hygrometers, and a syphon barometer.

See Eimer & Amend catalog page.

Today I added a Negretti & Zambra M2236 Typ2 aneroid barometer to the website.  I believe it was made in 1979.  It is unique in that it has an odometer-type digital display to indicate the pressure.  A knob on the barometer is turned until an indicator light changes, at which time the digital display indicates the pressure.  It obtains power from one 1.5 volt D cell battery.  The instruction booklet is available for download.  I found it in Germany.  It works well.

See Negretti & Zambra M2236 barometer.

I also added a second Safonovsky Gidrometpribor BAMM-1 barometer to the website.  This one was made in 1989 and works well.  It seems to have a more robust pressure mechanism than the non-functional 1978 BAMM-1 that was already on the website.  I found it in Montreal.

See Safonovsky Gidrometpribor BAMM-1 barometer.

Today I added a Dingens Eco-celli E038 tendency barometer to the instrument collection on the website. It's a clever device that uses Boyle's law and an automatically temperature-corrected pressure scale to measure sea level pressure.  Designed in 1998, it's intended to be a mercury-free school barometer, not an observatory barometer.  However it's also an attractive and affordable instrument for home use.

​See Eco-celli tendency barometer.

Today I updated the barometric calculation web pages in two areas:

• Calculation of Sea Level Pressure from Local Pressure - I added a downloadable, 3-page PDF document which presents the equations for this calculation, along with a numerical example. I also made a minor change in the downloadable Microsoft Excel spreadsheet for doing the calculation. The calculation is applicable to aneroid or mercury barometers.
• Calculation of Local Pressure from Mercury Column Height - I added a downloadable, 2-page PDF document which presents the equations for this calculation, along with a numerical example. I also made minor changes in the downloadable Microsoft Excel spreadsheet for doing the calculation. This calculation is applicable to mercury barometers only.

Go to Calculation of Sea Level Pressure from Local Pressure webpage.

​Go to Calculation of Local Pressure from Mercury Column Height webpage.

Today I posted a web page for a working CENCO model 76890 mercury barometer which has just entered my collection.  It dates from the 1940s and was an inexpensive model, both in the 1940s and today.

I also provided more information on the US manufacturer, the Ohio Thermometer Company.

See CENCO 76890 mercury barometer page.

See Ohio Thermometer page.

Today I scanned and posted a 1911 Short & Mason instrument catalog.  It's 92 pages and may be found on the the Taylor/Tycos/Short & Mason catalog page in the instrument catalog collection on the home page.

​Go to Taylor/Tycos/Short & Mason catalog page.