Perhaps from the 1940-50s, this F. Darton Thermo-Barograph is in good condition. Both ink bottles are present and about 2/3 full. I recently disassembled, stripped, and repainted the base. While doing so, I noticed one screw missing from the underside of the drum assembly; also the handle is missing. Neither will impact the operation of the machine. Note, some of the pics were taken with the cover unscrewed from the base, for clarity. I did wind up the clock/drum, and it appears to work fine. I would assume the clock would need to be adjusted (as accessed from the bottom). Below, is a description I pulled from the internet. I believe it is accurate to this tool. This person knows a lot more about this device than I do.. Vintage F Darton Metal Case Thermo Barograph. Darton Metal Case Thermo Barograph, thermo-barograph or a thermobarograph. Interestingly, the latter name was used by Negretti & Zambra to try and distinguish their instruments from the models by. Darton later became part of Russell Scientific Instruments Ltd. A Thermobarograph is a. The pressure is sensed by a metal gauge, known as an Aneroid, meaning. Since the amount of movement registered by a single aneroid is tiny, aneroids are often stacked in series (on top of one another) to amplify their motion. This particular barometer has 7 aneroids, which means that it is particularly sensitive. An aneroid is also known as a Vidie-can or Vidi in deference to the inventor, Frenchman, Lucien Vidi. The item “THERMO BAROGRAPH BAROTHERMOGRAPH F. Darton Watford London THEROBAROGRAPH” is in sale since Sunday, December 2, 2018. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “adekam1″ and is located in Corona del Mar, California. This item can be shipped worldwide.
- Maker: BAROGRAPH by F.Darton & Co Ltd of Watford & London
