From: Essay on medical pneumatology by By Jean Nicolas Demarquay and Samuel S. Wallian, 1889, page 265.  From a chapter on “Aerotherapy” or treatment with oxygen.  The oxygen was created chemically and then stored for use.

“Metal gasometers with a capacity from fifty to 100 gallons are generally adopted for office use when other than small quantities of gas are needed.  Zinc and galvanized iron are both used, the latter preferable because stronger and more durable.  The best forms have self-supporting frames and weights adapted to balance the weight of the bell, or gas holder, as it rises and falls.”