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| Below is help and answers to questions regarding Mercury Thermometers. If you have any other questions please email us by clicking on the link provided. |  |
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 | Part 1: This procedure applies to splits near the top of the column. You will need to fill a plastic beaker (in case of breakage) with hot tap water. Note there should be a pear shaped expansion of the capillary at the top of the thermometer. Place the thermometer vertically in the hot water and watch the mercury /spirit rise into the expanded capillary chamber at the top. You will find that the mercury/spirit and splits go into this chamber and as it gets to the widest part the split should burst through the mercury/spirit. (The mercury/spirit might form a little ball on the side of the thermometer) deftly flick the chamber with your index finger and the ball should drop down to the throat of the chamber to join the main bulk of mercury/spirit. Once the mercury/spirit is all in one piece allow the thermometer to cool at room temperature with the bulb still downwards. If you need more heat to push the splits into the chamber, use boiling water but you must not fill the chamber more than half full with mercury/spirit as the pressure will be too great and the bulb will fracture. If the thermometers are old they may keep splitting as the mercury/spirit can become oxidised in which case they will not be useable and will need to be replaced. Part 2: This procedure applies to splits near the bulb If splits are near the bulb, put the bulb into dry ice, if available, or the whole thermometer into a deep freezer. If the contraction of the mercury/spirit goes completely into the bulb, when allowing the thermometer to come back up to ambient, the splits should not reappear. If they do, try part 1.  |
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