While safety lamps were phased out for light-producing purposes in the mid-20th century, they still play a role in gas detection. This Pieler lamp is made expressly for gas detection and measurement. The flame would have been lowered to a small height. In the presence of methane, a blue "cap" would appear on the flame, with the height of the flame corresponding to the amount of methane in the air, easily measured by the scale built into the lamp
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