Exhibition Label Text: Carbon monoxide detector, 1950s to the present.
This device replaced the canary for the important job of carbon monoxide
detection. Air was collected in the bulb and squeezed into a glass tube.
Carbon monoxide present in the air caused the crystals to change colour.
The staining on the crystals was measured against the graph to determine
the level of carbon monoxide in the air
Glass tubes that taper to each end. Inside the tubes a section of white crystals at either end and brown crystals in the middle. The crystals cover a copper (?) spring shaped section, at on end and a copper (?) mesh section at the other. 1 tube disp. 8/99
l:17cm (x2) l:16cm (x3) and l:16.5cm