File:Heike Kamerlingh Onnes - 35 - Standard open mercury pressure gauge, built in 1898 by Gerrit Flim It consisted of fifteen 31-meter-long tubes connected in series.png
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Heike_Kamerlingh_Onnes_-_35_-_Standard_open_mercury_pressure_gauge,_built_in_1898_by_Gerrit_Flim_It_consisted_of_fifteen_31-meter-long_tubes_connected_in_series.png (400 × 418 pixels, file size: 87 KB, MIME type: image/png)