Engraving depicting the making of incandescent light bulbs

Engraving depicting the making of incandescent light bulbs. 1: Platinum wires with carbon filaments attached, fused to a glass stopper. 4: Glass tube. 5: Drawn out and blown into light bulbs. 2: Stopper (1) placed in the bulb. 3: Stopper and bulb fused together. 6: Lamp ready for exhaustion. 7: Exhausted and trimmed lamp bulb

Blown Bulb Bulbs Carbon Exhausted Exhaustion Filaments Fused Incandescent Placed Platinum Stopper Trimmed Wires

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