the air inside takes up less volume. This tool is often connected to a recording device, together forming a barograph. A pen moves against a rotating cylinder whenever the bellows moves and creates a visual aid to the pattern of falling and rising air pressure. The barograph remains a basic...
against the lower mouth of the glass tube when the membrane is raised, and with it the reel, by means of a lower screw that pushes said membrane through of a disk of rigid material, in order to isolate the mercury contained inside the barometer tube from the contents in the inner tank....
I am curious if the height of the Mercury column inside a Toricellian Mercury Barometer be the same if we use a tapering / stepped (unequal inner diameter [ID]) glass tube as depicted in the image below instead of a regular constant ID one? Note: I know that the ID of a barometer ...