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A simple variometer can be constructed by adding a large reservoir (a thermos bottle) to augment the storage capacity of a common aircraft rate-of-climb instrument.
en.wikipedia.org They are most effective in a vacuum thermos bottle or insulated cup with a lid (such as the often-used, foam take-away cups).
en.wikipedia.org Some systems are vacuum- insulated, acting something like large thermos bottles.
en.wikipedia.org The naggin bottle is typically the shape of a large hip flask, suitable for placing in a pocket.
en.wikipedia.org The glass plunger is then re-inserted and the liquid is added to the reaction flask.
en.wikipedia.org