It is assumed that adequate safety precautions are taken. On no account should this method be used outside properly-equipped laboratories or for purposes other than research. The apparatus disassembled. 100 mL gas burette with threaded top. Screw top with septum and syringe guide.
Water reservoir with tap at bottom.
The reservoir is filled with water. About half the water is now drained from the reservoir. Check that air is not leaking in past the septum. Take care at this stage not to introduce air bubbles into the gas burette. Be aware that sulphuric acid is corrosive.