!!!! Warburg's apparatus

https://www.reddit.com/r/chemistry/comments/fi1tao/im_back_with_one_more_weird_piece_of_glassware_a/ @@ Reddit discussion

https://www.chemistryworld.com/opinion/classic-kit-warburgs-manometer/3004950.article @@ Warburg manometer

https://mhc.andornot.com/en/list?q=warburg+reaction+flask&p=1&ps=20&topic_facet=Manometry+--+instrumentation @@ Warburg manometer in museums