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Date: |
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Description: | inscription, engraving, ASHWORTH'S PATENT. HEPPLEWHITE GRAY. STANLEY DERBY.
This safety lamp is called the 'Ashworth Hepplewhite Gray' lamp, made after 1887. It was often used to detect the presence of firedamp, a highly explosive gas. Two of the pillars are hollow and guide the air into the bottom of the lamp. When the flame is exposed to firedamp, it changes its appearance, and the miner is warned. The amounts of gas entering the lamp are so small that they are easily burnt up without causing an explosion.
Material: metal | Source: | Tyne & Wear Archives & Museums | Identifier: | emu.ecatalogue.science&industry.481441 | Go to resource |
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