Novelty By Exclusion

I was recently on holiday and found myself wandering through a greenhouse at the botanic gardens in Sheffield. I came across a liquid max/min thermometer hanging on a tree and this transported me back to a patent I drafted many years ago. Max/min thermometers are often found in greenhouses, to enable a gardener to determine the maximum and minimum temperatures found in a greenhouse, in order to ensure that neither the maximum temperature is too high, nor the minimum temperature too low. Nowadays most max/min thermometers are of a digital type, but the patent I drafted was to a traditional max/min thermometer that employs a liquid which expands and contracts due to temperature changes.