Of philadelhia brass case, glass front fine needle barometer. About 4 7/8 front case diameter.
4 1/4 back case diameter. With 1 diameter wall hanging ring. The letters p h b ii are stamped on the back inside a 5/32 diameter circle. The dial is graduated in 25 to 31 inches of mercury barometric pressure, accurate to 2 decimal places.
For example 28.42 it weighs 1 1/2 pounds. It does respond to change in barometric pressure. But the readings seem low.
Hence the need for calibration. Also something is loose inside. You can hear a metal to metal sound when it’s turned over. There are two dings on the side of the case.
The item “ANTIQUE STANDARD BRASS BAROMETER RIGGS & BRO PHILADELPHIA” is in sale since Tuesday, April 08, 2014. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “rnbsitler” and is located in Wrightsville, Pennsylvania. This item can only be shipped to United States.
- Maker: RIGGS & BRO
- Original/Reproduction: Original