Below is a much more recently
manufactured Ilford 'mercury in glass' thermometer; picture supplied
by David Muggleton.
Although marked with an immersion
depth (35mm) for measuring solution temperatures, the rectangular
design isn't the normal one used for a darkroom thermometer.
It can't, for example, be inserted down the small diameter hole
in the centre of a developing tank to measure developer temperature
during film development. The design looks more suited for wall
hanging, to monitor the overall air temperature of the darkroom.
David tells me he has no knowledge
of its intended use, but that the box is marked with the usual
Ilford dating system, this time G.81, meaning it was made around
July 1981.
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