Another great attic find in Mass! W E Hadlock & Company glass and wooden cased brass Barometer / Barograph. Just found and I know little about it, except it appears in excellent condition. What you see is what is for sale……. What is the purpose of the round short brass tube in the center? The item “W E Hadlock & Co. Boston Mass Early Barometer scientific Weather Barograph” is in sale since Sunday, October 30, 2016. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “freshpickins” and is located in Waterville, Maine. This item can be shipped to United States.